lintian: Lintian fixes

  - Stop depending on dh-systemd
  - We actually need to depend on usb-gadget-getty-ttyGS0.service

Change-Id: I39ae7eb6a07af2dc03c5e9eb9b63e1577606a00e
diff --git a/debian/control b/debian/control
index 2f99d12..8a1cb71 100644
--- a/debian/control
+++ b/debian/control
@@ -2,7 +2,7 @@
 Section: devel
 Priority: optional
 Maintainer: Coral <coral-support@google.com>
-Build-Depends: debhelper (>= 10), dh-systemd
+Build-Depends: debhelper (>= 10)
 Standards-Version: 3.9.8
 Homepage: https://coral.withgoogle.com/
 
diff --git a/debian/lintian-overrides b/debian/lintian-overrides
new file mode 100644
index 0000000..fe700f1
--- /dev/null
+++ b/debian/lintian-overrides
@@ -0,0 +1,2 @@
+usb-gadget: systemd-service-file-refers-to-unusual-wantedby-target lib/systemd/system/usb-gadget-getty-ttyGS0.service getty.target
+