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: I3738f8287d804ccd94e0a16ac0afb8b41b299c75 Signed-off-by: Ken Zhang <kenz@codeaurora.org> Signed-off-by: Naseer Ahmed <naseer@codeaurora.org>