drm/omap: rename color_mode to fourcc

Now that we use fourccs, we can also rename the 'color_mode' variables
to 'fourcc'.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
diff --git a/drivers/gpu/drm/omapdrm/dss/omapdss.h b/drivers/gpu/drm/omapdrm/dss/omapdss.h
index b339edc..bbda935 100644
--- a/drivers/gpu/drm/omapdrm/dss/omapdss.h
+++ b/drivers/gpu/drm/omapdrm/dss/omapdss.h
@@ -268,7 +268,7 @@ struct omap_overlay_info {
 	u16 screen_width;
 	u16 width;
 	u16 height;
-	u32 color_mode;
+	u32 fourcc;
 	u8 rotation;
 	enum omap_dss_rotation_type rotation_type;
 	bool mirror;
@@ -316,7 +316,7 @@ struct omap_dss_writeback_info {
 	u16 buf_width;
 	u16 width;
 	u16 height;
-	u32 color_mode;
+	u32 fourcc;
 	u8 rotation;
 	enum omap_dss_rotation_type rotation_type;
 	bool mirror;