drm/msm/sde: Add dither feature support

Add dither feature interface for default panel dither config and user
dither config.

Change-Id: I2e67a9f1372355724c380e9643921025bf98fc97
Signed-off-by: Ping Li <pingli@codeaurora.org>
Signed-off-by: Narendra Muppalla <NarendraM@codeaurora.org>
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index 665ed365..01fd97c 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -154,6 +154,7 @@
 	/* blob properties, always put these first */
 	CONNECTOR_PROP_SDE_INFO,
 	CONNECTOR_PROP_HDR_INFO,
+	CONNECTOR_PROP_PP_DITHER,
 
 	/* # of blob properties */
 	CONNECTOR_PROP_BLOBCOUNT,