msm: vidc: Fix race condition in power collapse sequence

There is a race condition if client queued an ETB between
RELEASE_RESOURCE (OCMEM) and PC_PREP commands in power
collapse sequence where the client will never receive
ETB_DONE because the clocks are already turned off.
Avoid the problem by counting the number of commands
queued to video hardware to skip power collapse sequence
if client queues any commands.

Change-Id: I0bb908e11308cfc4f8bdbdc01fd92dac67b78eac
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>