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

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

Change-Id: If2063c2f7fdb4857d5a86f4d544f1843eb7e1e12