drm: omapdrm: Move DISPC_CLK_SWITCH reg feature to struct dss_features

The register belongs to the DSS, move the feature to the dss_features
structure.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
diff --git a/drivers/gpu/drm/omapdrm/dss/dss.h b/drivers/gpu/drm/omapdrm/dss/dss.h
index b7ce0ea..ac64260 100644
--- a/drivers/gpu/drm/omapdrm/dss/dss.h
+++ b/drivers/gpu/drm/omapdrm/dss/dss.h
@@ -200,6 +200,11 @@ struct dss_pll {
 	struct dss_pll_clock_info cinfo;
 };
 
+/* Defines a generic omap register field */
+struct dss_reg_field {
+	u8 start, end;
+};
+
 struct dispc_clock_info {
 	/* rates that we get with dividers below */
 	unsigned long lck;