msm: camera: Add protection for IRQ storm

VFE composite irq 3 is handled by CAMSS
microcontroller. If microcontroller goes into bad
state and does not clear out irq status bit, there
would be irq storm and result in watchdog bite.
This change ensures if the bits are not clear by
microcontroller, the vfe driver will clear the bits.

Change-Id: I36d53bee215c834c4b43f5ee195925babeb930d7
Signed-off-by: Kevin Chan <ktchan@codeaurora.org>