msm: sde: add support for sync file to sde rotator

Sync file is used for buffer synchronization between
user mode components and kernel mode drivers. Add support
to sde rotator to use sync file for synchronization of input
and output buffers.

CRs-Fixed: 2009709
Change-Id: Ib0453e2368f6c6c6d1b6bba2c16b111522e42748
Signed-off-by: Alan Kwong <akwong@codeaurora.org>