lintian: Add explicit source format

Change-Id: I09bb6b50378f12112ada991fd0b7c2097447655a
(cherry picked from commit 35232fce57220ddd8d513b3da517c48cc3d0a989)
1 file changed
tree: 55d1874ac760c89b5dc0fd85a7c25b1188fbce85
  1. debian/
  2. etc/
  3. usr/