drm/msm/sde: add ctl start interrupt support in sde

Add ctl start interrupt support on sde to receive the
interrupt for command mode and writeback displays.

Change-Id: If8cecfc0549e2388c2086826a6265816a51b7615
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>
2 files changed