Revert "certify_bootimg: support --extra_footer_args" am: dc7cea59b3

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

Change-Id: I428afe940d29d494242642f764f499ae4bca0f49
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>