Merge "camera2: Document minimum pixel array size restriction for ultra high...

Merge "camera2: Document minimum pixel array size restriction for ultra high resolution sensors." into sc-dev am: 508132d5 am: 3da17d0f am: c5ad72aa am: 468be2bb

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/15507096

Change-Id: I9bcb64879367b2023fe414f51d54593d1149d161