msm: camera: cdm: handle dead lock scenario

This change handles a race condition in which cdm workqueue is
scheduled on one of the cores and cdm flush is executing on
another core. We come across a dead lock between fifo_lock and
hw_mutex lock.

CRs-Fixed: 3049531
Change-Id: Ie0b8982a7e55218fc5655f8e3d08a952fd852ed7
Signed-off-by: Vikram Sharma <vikramsa@codeaurora.org>