Revert "certify_bootimg: support --extra_footer_args" am: dc7cea59b3 am: fa2b0539d9 am: 7d6c797e2c am: 5a2b951d16

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

Change-Id: I15cbe51a22a46fdda58237a5c7a94d415f696d25
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>