msm: ais: free gpio and irq when force shutdown

There is no place to free gpio and irq in case of
shutdown, so add them to cam_sensor_shutdown, or
probe will be failed when next power up.

Change-Id: I239f5c5e99858b362bceb8402b8d29a1f4f84cde
Signed-off-by: YUE CHEN <yueche@codeaurora.org>