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

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

Change-Id: Ic854fb1ed16ed302d23ca2b338f4abbf9500525f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>