OMAPDSS: add OMAP_DISPLAY_TYPE_DVI

Add new display bus type for DVI. This is not used by omapdss driver
itself, but is used by external encoder chips that output DVI.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
diff --git a/include/video/omapdss.h b/include/video/omapdss.h
index cca912a..cff514e 100644
--- a/include/video/omapdss.h
+++ b/include/video/omapdss.h
@@ -70,6 +70,7 @@
 	OMAP_DISPLAY_TYPE_DSI		= 1 << 3,
 	OMAP_DISPLAY_TYPE_VENC		= 1 << 4,
 	OMAP_DISPLAY_TYPE_HDMI		= 1 << 5,
+	OMAP_DISPLAY_TYPE_DVI		= 1 << 6,
 };
 
 enum omap_plane {