msm: camera: Fix the random cci read id failure

For some sensors, the device cci read is failing. The
wait_for_completion_timeout terminates before the rd done
cci irq is fired subsequently causing 0 words read from read
buffer. The fix is to re-initialize the completion.

Change-Id: I1621d68da6ce59f88d9a260f8b575343c4898236
Signed-off-by: Nishant Pandit <npandit@codeaurora.org>