lintian: Lintian fixes

  - basic.target is actually a real systemd target that we should be depending on
    for this package.
  - Add debian package source format.

Change-Id: I265e076ed842223ab899875f0e16f984eace5b83
diff --git a/debian/lintian-overrides b/debian/lintian-overrides
new file mode 100644
index 0000000..6c0adf2
--- /dev/null
+++ b/debian/lintian-overrides
@@ -0,0 +1,2 @@
+imx-firmware: systemd-service-file-refers-to-unusual-wantedby-target lib/systemd/system/btfw_loader.service basic.target
+
diff --git a/debian/source/format b/debian/source/format
new file mode 100644
index 0000000..d3827e7
--- /dev/null
+++ b/debian/source/format
@@ -0,0 +1 @@
+1.0