drm/msm/sde: add autorefresh property to sde crtc

Add initial exposure of an autorefresh property, as well as a
basic check to prevent autorefresh and partial update feature
concurrency.

Change-Id: I3078c2b940ed90ed502e2aba9f688c58990fed87
Signed-off-by: Lloyd Atkinson <latkinso@codeaurora.org>
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index 4471d0b..934bea1 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -164,6 +164,7 @@
 	/* enum/bitmask properties */
 	CONNECTOR_PROP_TOPOLOGY_NAME,
 	CONNECTOR_PROP_TOPOLOGY_CONTROL,
+	CONNECTOR_PROP_AUTOREFRESH,
 
 	/* total # of properties */
 	CONNECTOR_PROP_COUNT