Revert "certify_bootimg: support --extra_footer_args" am: dc7cea59b3 am: fa2b0539d9 am: 7d6c797e2c

Original change: https://android-review.googlesource.com/c/platform/system/tools/mkbootimg/+/2113384

Change-Id: Id29d8134bf482fe2531082c007354c5d92508484
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>