Merge "Camera: Clarify SCALER_CROP_REGION usage" into rvc-dev am: 601e34fd am: 794e42e5 am: dd0c3c19 am: bf3a18c2

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

Change-Id: I25973364e6649c6caf20d017493b15e936b1a2a0