msm: rotator: sync point support
Add MSM_ROTATOR_IOCTL_BUFFER_SYNC ioctl interface.
Rotator will create a timeline for each session at START, wait for
input fence and create released fence in this ioctl call,
signal the timeline after rotation is done.

Change-Id: Idf8063707c9979f6cbb2d2818bf25b30398ad82a