msm: vidc: Add support for interframe power collapse

On targets that support it (namely apq8084), give up control of the
core0 and core1 GDSCs to the hardware so that it can independently
decide to powercollapse when no hardware operations are being performed
on the respective cores.

Change-Id: I09397fde101cc0b91b97c0ae646ea09e8b117b9d
Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>