msm: camera: cdm: Acquire mutex lock before accessing client data

There is a chance of use after release of client data in
cdm internal operation calls. Hence acquire mutex lock whenever
accessing client data to avoid use after release scenario.

CRs-Fixed: 3010261
Change-Id: I853854ada5e776b5d9fe34a05cd5fbd1001d68f7
Signed-off-by: Shravya Samala <shravyas@codeaurora.org>