drm: sun4i: Add RGB output

One of the A10 display pipeline possible output is an RGB interface to
drive LCD panels directly. This is done through the first channel of the
TCON that will output our video signals directly.

Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

drivers/gpu/drm/sun4i/sun4i_tcon.h

@@ -161,6 +161,8 @@ struct sun4i_tcon {
 
 	/* Platform adjustments */
 	bool				has_mux;
+
+	struct drm_panel		*panel;
 };
 
 /* Global Control */