Clean up packaging, source compress_lz4 from a Build-Depends

- Remove example pre/post scripts
- Reformat control
- Use compress_lz4 from boot-keys package

Change-Id: I8a1d4f8a1582442fc972af6f1f720e0f4269112e
diff --git a/debian/control b/debian/control
index f836b2b..0098a33 100644
--- a/debian/control
+++ b/debian/control
@@ -1,6 +1,18 @@
 Source: linux-mtk
 Maintainer: AIY Projects <support-aiyprojects@google.com>
-Build-Depends: debhelper (>= 10), bc, cpio, debhelper, gcc-aarch64-linux-gnu, libssl-dev:native, python, gcc-arm-linux-gnueabihf, u-boot-mkimage, liblz4-tool, boot-keys, device-tree-compiler
+Build-Depends:
+    bc,
+    boot-keys,
+    cpio,
+    debhelper (>= 10),
+    debhelper,
+    device-tree-compiler,
+    gcc-aarch64-linux-gnu,
+    gcc-arm-linux-gnueabihf,
+    liblz4-tool,
+    libssl-dev:native,
+    python,
+    u-boot-mkimage
 Section: misc
 Priority: optional
 
diff --git a/debian/postinst.ex b/debian/postinst.ex
deleted file mode 100644
index 70e9ea9..0000000
--- a/debian/postinst.ex
+++ /dev/null
@@ -1,39 +0,0 @@
-#!/bin/sh
-# postinst script for linx-mtk
-#
-# see: dh_installdeb(1)
-
-set -e
-
-# summary of how this script can be called:
-#        * <postinst> `configure' <most-recently-configured-version>
-#        * <old-postinst> `abort-upgrade' <new version>
-#        * <conflictor's-postinst> `abort-remove' `in-favour' <package>
-#          <new-version>
-#        * <postinst> `abort-remove'
-#        * <deconfigured's-postinst> `abort-deconfigure' `in-favour'
-#          <failed-install-package> <version> `removing'
-#          <conflicting-package> <version>
-# for details, see https://www.debian.org/doc/debian-policy/ or
-# the debian-policy package
-
-
-case "$1" in
-    configure)
-    ;;
-
-    abort-upgrade|abort-remove|abort-deconfigure)
-    ;;
-
-    *)
-        echo "postinst called with unknown argument \`$1'" >&2
-        exit 1
-    ;;
-esac
-
-# dh_installdeb will replace this with shell code automatically
-# generated by other debhelper scripts.
-
-#DEBHELPER#
-
-exit 0
diff --git a/debian/postrm.ex b/debian/postrm.ex
deleted file mode 100644
index 112afba..0000000
--- a/debian/postrm.ex
+++ /dev/null
@@ -1,37 +0,0 @@
-#!/bin/sh
-# postrm script for linx-mtk
-#
-# see: dh_installdeb(1)
-
-set -e
-
-# summary of how this script can be called:
-#        * <postrm> `remove'
-#        * <postrm> `purge'
-#        * <old-postrm> `upgrade' <new-version>
-#        * <new-postrm> `failed-upgrade' <old-version>
-#        * <new-postrm> `abort-install'
-#        * <new-postrm> `abort-install' <old-version>
-#        * <new-postrm> `abort-upgrade' <old-version>
-#        * <disappearer's-postrm> `disappear' <overwriter>
-#          <overwriter-version>
-# for details, see https://www.debian.org/doc/debian-policy/ or
-# the debian-policy package
-
-
-case "$1" in
-    purge|remove|upgrade|failed-upgrade|abort-install|abort-upgrade|disappear)
-    ;;
-
-    *)
-        echo "postrm called with unknown argument \`$1'" >&2
-        exit 1
-    ;;
-esac
-
-# dh_installdeb will replace this with shell code automatically
-# generated by other debhelper scripts.
-
-#DEBHELPER#
-
-exit 0
diff --git a/debian/preinst.ex b/debian/preinst.ex
deleted file mode 100644
index bdbce64..0000000
--- a/debian/preinst.ex
+++ /dev/null
@@ -1,35 +0,0 @@
-#!/bin/sh
-# preinst script for linx-mtk
-#
-# see: dh_installdeb(1)
-
-set -e
-
-# summary of how this script can be called:
-#        * <new-preinst> `install'
-#        * <new-preinst> `install' <old-version>
-#        * <new-preinst> `upgrade' <old-version>
-#        * <old-preinst> `abort-upgrade' <new-version>
-# for details, see https://www.debian.org/doc/debian-policy/ or
-# the debian-policy package
-
-
-case "$1" in
-    install|upgrade)
-    ;;
-
-    abort-upgrade)
-    ;;
-
-    *)
-        echo "preinst called with unknown argument \`$1'" >&2
-        exit 1
-    ;;
-esac
-
-# dh_installdeb will replace this with shell code automatically
-# generated by other debhelper scripts.
-
-#DEBHELPER#
-
-exit 0
diff --git a/debian/prerm.ex b/debian/prerm.ex
deleted file mode 100644
index 12b0d26..0000000
--- a/debian/prerm.ex
+++ /dev/null
@@ -1,38 +0,0 @@
-#!/bin/sh
-# prerm script for linx-mtk
-#
-# see: dh_installdeb(1)
-
-set -e
-
-# summary of how this script can be called:
-#        * <prerm> `remove'
-#        * <old-prerm> `upgrade' <new-version>
-#        * <new-prerm> `failed-upgrade' <old-version>
-#        * <conflictor's-prerm> `remove' `in-favour' <package> <new-version>
-#        * <deconfigured's-prerm> `deconfigure' `in-favour'
-#          <package-being-installed> <version> `removing'
-#          <conflicting-package> <version>
-# for details, see https://www.debian.org/doc/debian-policy/ or
-# the debian-policy package
-
-
-case "$1" in
-    remove|upgrade|deconfigure)
-    ;;
-
-    failed-upgrade)
-    ;;
-
-    *)
-        echo "prerm called with unknown argument \`$1'" >&2
-        exit 1
-    ;;
-esac
-
-# dh_installdeb will replace this with shell code automatically
-# generated by other debhelper scripts.
-
-#DEBHELPER#
-
-exit 0
diff --git a/debian/rules b/debian/rules
index cfa5252..6959042 100755
--- a/debian/rules
+++ b/debian/rules
@@ -31,7 +31,7 @@
 	+make ${KERNEL_OPTIONS} -j$(shell nproc) Image modules dtbs
 	${CROSS_COMPILE}objcopy -O binary -R .note -R .comment -S vmlinux linux.bin
 
-	compress_lz4 linux.bin
+	/boot/compress_lz4.sh linux.bin
 
 	cp /boot/kernel-fit-image.its .
 	mtk-mkimage -D "-I dts -O dtb -p 1024" -k /boot/keys -f kernel-fit-image.its boot.img
diff --git a/debian/source/format b/debian/source/format
deleted file mode 100644
index 89ae9db..0000000
--- a/debian/source/format
+++ /dev/null
@@ -1 +0,0 @@
-3.0 (native)