Gallery2: Crop DDM output for smaller FOV oon aux Camera

When the FOV on the aux camera is smaller than the main,
DDM is forced to crop the affected area due to a smaller co-visible
intersection between the two shots. Gallery will take this into
consideration and crop the resulting bitmap with the ROI rect
provided by DDM.

Change-Id: If0f1ea9815650e4b7cf6cdb6d1f5a9f2638b92ee