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: b0b1143f

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

Change-Id: I05c88ffe3b3aa60a8d56b29ef5102b12b51cc44a