msm: camera: tfe: Handle sof monotonic boot time stamp

Modify the sof monotonic boot timestamp logic. Boot time
stamp difference between two frames should not change,
it should be same as qtime csid time stamp difference.
So modified logic to give proper boot time stamp with no
difference in the successive frames, the difference of sof
time stamp taken from qtime stamp value.
Delayed IRQ handling can lead to torn read of timestamp
register (LSB from nth frame and MSB from n+1th frame).
This change tries to detect torn read cases and corrects
timestamp close to the actual value.

CRs-Fixed: 2688271
Change-Id: I1dc75629887cfcf971d51a7dae6ea28624d272f1
Signed-off-by: Ravikishore Pampana <rpampana@codeaurora.org>