disp: msm: dsi: Remove drm_panel tracking from sde_connector

The drm_panel defined in sde_connector was not used, so
removed it.

Change-Id: I70a94f11ebd60362d25e37a256f46d3d4942089d
Signed-off-by: Yuan Zhao <yzhao@codeaurora.org>

msm/sde/sde_connector.c

@@ -2375,7 +2375,6 @@ struct drm_connector *sde_connector_init(struct drm_device *dev,
 
 	c_conn->connector_type = connector_type;
 	c_conn->encoder = encoder;
-	c_conn->panel = panel;
 	c_conn->display = display;
 
 	c_conn->dpms_mode = DRM_MODE_DPMS_ON;