Revert "Revert "certify_bootimg: support --extra_footer_args"" am: bafafbc994 am: 57dc8cdc82

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

Change-Id: I9fac1eaf62965e0f227c998864349f6c0182ba09
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>