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

BugLink: https://bugs.launchpad.net/bugs/1952845



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.

Change-Id: I9d465de485d25a411e05bfd35fa9352eda5ed432
Signed-off-by: E V Ravi <evenka@codeaurora.org>
(cherry picked from commit 8d8a0163b09d779c12ba8c62f23a8316b6e09eef)
Signed-off-by: Shrirang Bagul <shrirang.bagul@canonical.com>