Revert "Revert "certify_bootimg: support --extra_footer_args"" am: bafafbc994

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

Change-Id: I0d2c417f6d37e15dd0baa4d66c8bd1baccb09fec
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>