Merge "Camera: Clarify SCALER_CROP_REGION usage" into rvc-dev am: 601e34fd am: bf6e7310 am: f5c645e8 am: ae2e2991

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

Change-Id: Ia4007d636d33e8c05ef40df50919839e4b0d1947