[automerger skipped] Merge "gav1: Support monochrome videos/images" into sc-dev am: 6a7bbeed am: 9d7f6531 -s ours am: 50f07c32 -s ours

am skip reason: skipped by user jzern

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/15147616

Change-Id: I74235d6c51e2eb62640ea0687c173e87e4a1a54b