[automerger skipped] gav1: Support monochrome videos/images am: ca7d1abc am:...

[automerger skipped] gav1: Support monochrome videos/images am: ca7d1abc am: 3d614660 am: d410271e am: 56939a69 -s ours

am skip reason: Merged-In I87eb5e11ab8bd88d4d3baf8d59c3bc53398b288d with SHA-1 e7718810 is already in history

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/1743307

Change-Id: I015401a480c0f4d58c6a7bcf378a204be2a06efe