Enable cos_patch_trailer_check.

BUG=b/175733030
TEST=manual test on changelist.
RELEASE_NOTE=None

Change-Id: I26f609a7857b1639a83400e65d5665f8d9339ce2
Reviewed-on: https://cos-review.googlesource.com/c/third_party/overlays/portage-stable/+/9783
Reviewed-by: Dexter Rivera <riverade@google.com>
Tested-by: Vaibhav Rustagi <vaibhavrustagi@google.com>
1 file changed