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

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

Change-Id: I8a0f378dd8a8ff5709783edaba56a89e5253398d