mm-video-v4l2: Amend perflock hint logic

Video clients need to acquire(release) perflock
with hint MPCTLV3_VIDEO_ENCODE(DECODE)_PB_HINT
when video session opened(closed), perflock service
will do the necessary actions based on the hints
in order to improve video usecases performance.

Change-Id: Id11b10e700e84936785a66cbd3aad3b301d26866
5 files changed