Merge "Camera: Clarify SCALER_CROP_REGION usage" into rvc-dev am: 601e34fdd7 am: 794e42e566 am: 55582b0c4a

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

Change-Id: I2d5c4d68092b840f0081de8ad189bb89d37cad00