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: Iaf7f41d56301299a6f63a5dc1090334063019881
Signed-off-by: Shravya Samala <shravyas@codeaurora.org>