msm: cam: isp: add sof time stamp support

Add sof time stamp support in the isp code.
Cam isp context send the sof time stamp after receiving the epoch
hardware event. Hardware manager get sof time stamp from CSID device
module. CSID module driver read the sof time stamp registers and
provide the time stamp value.
ISP context send the sof time stamp value to userspace through v4l2 event.

Change-Id: Ib858927c1ae11835a1988967dfbd3d104ae26b16
Signed-off-by: Ravikishore Pampana <rpampana@codeaurora.org>
Signed-off-by: Jing Zhou <jzhou70@codeaurora.org>