msm: camera: Enable RDI snapshot.

Add support for snapshot through raw dump interface which bypasses
image processing pipeline. This will be used in case of concurrent
camera when PIX interface is used by one camera. Do a bus reload
for ping pong buffers individually for each write master for every
mode that it is started with, as a global reset command may not have
been issued. Add separate bus scale parameter and keep the crystal
clock unmodified in case of RDI camera snapshot operation in
parallel with PIX camera.

Change-Id: I8b1eb70e623ecd9cc8fe02b5a58e496aa2c016c4
Signed-off-by: Nishant Pandit <npandit@codeaurora.org>
Signed-off-by: Kiran Kumar H N <hurlisal@codeaurora.org>