msm: vidc: Remove SYS_IDLE dependency for power collapse feature

Schedule delayed work for every command which will be executed
if no commands were being sent to video hardware. This way we can
avoid the SYS_IDLE response dependency for power collapse feature.

Change-Id: I9f9f0b84f6f86042e018955b6bfed60fc8d84201
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>