disp: msm: sde: store drm panel in sde connector

Drm panel pointer is no longer available in the drm connector.
This change stores the drm panel in the sde connector.

Change-Id: Ia7ed35d1f0914c45e34f15b02c8a3d8c32292ee6
Signed-off-by: Nilaan Gunabalachandran <ngunabal@codeaurora.org>

msm/sde/sde_connector.h

@@ -488,6 +488,7 @@ struct sde_connector {
 	int connector_type;
 
 	struct drm_encoder *encoder;
+	struct drm_panel *panel;
 	void *display;
 	void *drv_panel;
 	void *mst_port;