msm: camera: Return IRQ_NONE from irq handlers

IRQ_NONE need to return even if irq handler get the invalid
parameters or encounter error condition.
If IRQ_NONE handled value not return from irq handler, same
irq comes again.

Change-Id: I94f4ac9935a2d611734be8f669d5d43388d63ab4
Signed-off-by: Ravikishore Pampana <rpampana@codeaurora.org>