msm: camera: cci: Add mutex_q lock for cci_init

cci_write is being executed meanwhile cci_init is called,
which will maybe cause cci timeout since cci_init will do
reset operation. So add the mutex_q lock which is used by
cci_write into cci_init.

Change-Id: I81c67f27205f4250f08ca7ab38799f6454578dbd
Signed-off-by: Ziyu Jian <ziyujiang@codeaurora.org>