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: I3f52efbfb28621730ca1824e4890b2e90d413830
Signed-off-by: Shravya Samala <shravyas@codeaurora.org>