Merge "Camera: Clarify SCALER_CROP_REGION usage" into rvc-dev am: 601e34fdd7 am: 794e42e566 am: 55582b0c4a am: 6e3a79abd9

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

Change-Id: I25729edb4d38b9adee87220d2e6298d3588a3d86