drm/msm/sde: add secure fb translation mode for writeback

Add secure fb translation mode property to writeback connector
to support secure writeback. Writeback buffer can be non-secure
and secure.

Change-Id: Icdf915a139eb508db76a58cd2f1f58b2943bc541
Signed-off-by: Alan Kwong <akwong@codeaurora.org>
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index c6943de..9cde834 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -175,6 +175,7 @@
 	CONNECTOR_PROP_TOPOLOGY_CONTROL,
 	CONNECTOR_PROP_AUTOREFRESH,
 	CONNECTOR_PROP_LP,
+	CONNECTOR_PROP_FB_TRANSLATION_MODE,
 
 	/* total # of properties */
 	CONNECTOR_PROP_COUNT