Revert "Revert "certify_bootimg: support --extra_footer_args"" am: bafafbc994 am: 57dc8cdc82 am: 309a17f40a am: e2df0f7f4d am: 72053f3db8

Original change: https://android-review.googlesource.com/c/platform/system/tools/mkbootimg/+/2116236

Change-Id: I0dc4fee7a5369c5cd545fbbbec50c310f8df9e2c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>