msm: camera: Add api for axi halt and axi stop

 - Add api for axi halt and axi stop. Axi stop disables the write masters
based on port information and calls axi halt if not in concurrent
use case.
 - Add support to disable axi halt for snapshot to preview transition

Change-Id: I5d0b7436d1f1a67e1c25e902c244bdb8bca1a466
Signed-off-by: Nishant Pandit <npandit@codeaurora.org>