msm: display: Buffer sync point support

Add MSMFB_BUFFER_SYNC ioctl for the communication of
the acquired and released fence fd between kernel and hwc.

Wait for acquired fence before pan display.
Signal the previous released fence after pan display

Change-Id: Ief14b55fc9905efafe10be93bbba2073dc2041c6
Signed-off-by: Ken Zhang <kenz@codeaurora.org>
Signed-off-by: Vishnuvardhan Prodduturi <vproddut@codeaurora.org>
3 files changed