Remove boot.scr from board/

- Relocate this to packages/uboot-imx so that it's actually owned by a package

Change-Id: If6be8e684394ec6913c9b5ffca56553c5bcad2d9
diff --git a/boot.txt b/boot.txt
deleted file mode 100644
index 0e61229..0000000
--- a/boot.txt
+++ /dev/null
@@ -1,20 +0,0 @@
-fdt_addr=0x43000000
-fdt_file=fsl-imx8mq-phanbell.dtb
-image=Image
-script=boot.scr
-mmc_root="PARTUUID=70672ec3-5eee-49ff-b3b1-eb1fbd406bf5"
-sd_root="/dev/mmcblk1p2"
-
-# Check boot device to decide which root partition to use
-if test ${bootdev} = 1; then
-    setenv root ${sd_root}
-else
-    setenv root ${mmc_root}
-fi
-
-cmdline="console=ttymxc0,115200 earlycon=ec_imx6q,0x30860000,115200 root=${root} rootfstype=ext4 rw rootwait init=/sbin/init net.ifnames=0"
-
-ext2load mmc ${bootdev}:1 ${loadaddr} ${image}
-ext2load mmc ${bootdev}:1 ${fdt_addr} ${fdt_file}
-setenv bootargs ${cmdline}
-booti ${loadaddr} - ${fdt_addr}