Merge "Camera: Clarify SCALER_CROP_REGION usage" into rvc-dev am: 601e34fdd7 am: bf6e731010 am: f5c645e8a2

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12586676

Change-Id: Iad9a7e2ebc41345877c6f230c13f9ae818861826