msm: vidc: Remove power lock dependency on power collapse feature

The "clk_pwr_lock" lock is not necessary for power collapse feature.
The clock gating ON and OFF functions are also unused and hence
removed the lock and clock gating functions and made the necessary
changes for proper video and power collapse feature functionality.
Do not set the receive request on debug queue when it is empty
which will make video hardware to generate interrupt unnecessarily
when debug message is available, interrupt is necessary when there
is a response message available in the message queue.

Change-Id: I2ec1d9411ddfe1040acde73861d30c34c69abae6
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>