msm: camera2: cpp: Support queue and timer clean up.

The timer callback is triggered after the node shutdown under
some error conditions. The timer callback should be avoided
in such cases. If in some race condition the timer callback is
triggered then it needs to check the state before timeout
processing.

Change-Id: Ic5663c69f556f30592ff6eb20f99c7c4a5ac859d
Signed-off-by: Rajakumar Govindaram <rajakuma@codeaurora.org>