Merge changes from topic "camera" into p9.0
* changes:
Fix crash if Exif-Tag buffer-length and component-count are both 0
Camera2: Fix Undo button behaviour
Camera2: Remove google help preference
Camera2: Add option to set max screen brightness
Camera: Powerkey shutter (2/2)
Camera2: Request for ACCESS_FINE_LOCATION permission
Camera2: Stop using GPS when going to background
Camera2: Remove settings preferences only once
Camera2: Only autofocus before a snap if we are actually in "auto" mode.
Don't attempt to convert degree to orientation enum twice
Camera2: Target API 27