OMAP: DSS2: DSI: Improve dsi_mux_pads parameters

dsi_mux_pads() needs to know about the DSI HW module and the DSI lanes
used. Split the function into two, enable and disable, which take
necessary arguments, and add empty implementations for both.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
diff --git a/include/video/omapdss.h b/include/video/omapdss.h
index 3b55ef2..c4d1d4e 100644
--- a/include/video/omapdss.h
+++ b/include/video/omapdss.h
@@ -242,7 +242,8 @@
 	int num_devices;
 	struct omap_dss_device **devices;
 	struct omap_dss_device *default_device;
-	void (*dsi_mux_pads)(bool enable);
+	int (*dsi_enable_pads)(int dsi_id, unsigned lane_mask);
+	void (*dsi_disable_pads)(int dsi_id, unsigned lane_mask);
 };
 
 #if defined(CONFIG_OMAP2_DSS_MODULE) || defined(CONFIG_OMAP2_DSS)