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/drivers/video/omap2/dss/display.c b/drivers/video/omap2/dss/display.c
index 0daf3e3..fafe7c9 100644
--- a/drivers/video/omap2/dss/display.c
+++ b/drivers/video/omap2/dss/display.c
@@ -61,6 +61,7 @@
 	case OMAP_DISPLAY_TYPE_VENC:
 	case OMAP_DISPLAY_TYPE_SDI:
 	case OMAP_DISPLAY_TYPE_HDMI:
+	case OMAP_DISPLAY_TYPE_DVI:
 		return 24;
 	default:
 		BUG();