drm/omap: fix YUV422 90/270 rotation with mirroring

When rotating 90/270 + mirroring with YUV422, the end result will have
adjacent pixels swapped. The problem is that
dispc_ovl_set_rotation_attrs() has wrong rotation values for these
cases.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>

drivers/gpu/drm/omapdrm/dss/dispc.c

@@ -1819,13 +1819,13 @@ static void dispc_ovl_set_rotation_attrs(enum omap_plane_id plane, u8 rotation,
 				vidrot = 2;
 				break;
 			case DRM_MODE_ROTATE_90:
-				vidrot = 3;
+				vidrot = 1;
 				break;
 			case DRM_MODE_ROTATE_180:
 				vidrot = 0;
 				break;
 			case DRM_MODE_ROTATE_270:
-				vidrot = 1;
+				vidrot = 3;
 				break;
 			}
 		} else {