QCamera2/HAL3: Add dynamic black and white level conditionally

As per the new HAL3 spec, dynamic black and white level tags
should be added to available result keys only if optical
black regions is supported on a given device.

CRs-Fixed: 998824
BUG=28276885

Change-Id: I862372620846bf5154e8084394a22b49d96ec03c
1 file changed