[automerger skipped] Merge "gav1: Support monochrome videos/images" into sc-dev am: 6a7bbeed -s ours am: 10ff998e -s ours

am skip reason: skipped by user jzern

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

Change-Id: I0dc8b007cd8d2441e1a9a0a16803029ba20d8f6a