msm: camera: support output-duplication in cpp

If two streams need same output buffer from cpp, duplication
functionality from cpp hardware can be used. This elminates need for
redundant 2-pass processing.

Change-Id: I672362360472fe9485acebc6abef89ba8a587b72
Signed-off-by: Punit Soni <punits@codeaurora.org>