msm: camera: handle simultaneous SOF and stat interrupts.

Sometimes a stat interrupt arrives just before the next SOF,
such that the VFE bundles the two interrupts together into one.
In such a scenario, the frame id sent along with the stat interrupt
message will incorrectly carry the farme number for the next frame.
This change checks for such occurences and adjusts the frame
id accordingly.

Change-Id: I9914c428baf74cab81aade62843b9043f20108f9
Signed-off-by: Ankit Premrajka <ankitp@codeaurora.org>