OMAP: DSS2: move set/get_update_mode()

Move set/get_update_mode() from omap_dss_device to omap_dss_driver.

This is part of a larger patch-set, which moves the control from omapdss
driver to the display driver.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>
diff --git a/drivers/video/omap2/omapfb/omapfb-ioctl.c b/drivers/video/omap2/omapfb/omapfb-ioctl.c
index cb2e343..4f68cb0 100644
--- a/drivers/video/omap2/omapfb/omapfb-ioctl.c
+++ b/drivers/video/omap2/omapfb/omapfb-ioctl.c
@@ -202,7 +202,7 @@
 	enum omap_dss_update_mode um;
 	int r;
 
-	if (!display || !display->set_update_mode)
+	if (!display || !display->driver->set_update_mode)
 		return -EINVAL;
 
 	switch (mode) {
@@ -222,7 +222,7 @@
 		return -EINVAL;
 	}
 
-	r = display->set_update_mode(display, um);
+	r = display->driver->set_update_mode(display, um);
 
 	return r;
 }
@@ -233,10 +233,15 @@
 	struct omap_dss_device *display = fb2display(fbi);
 	enum omap_dss_update_mode m;
 
-	if (!display || !display->get_update_mode)
+	if (!display)
 		return -EINVAL;
 
-	m = display->get_update_mode(display);
+	if (!display->driver->get_update_mode) {
+		*mode = OMAPFB_AUTO_UPDATE;
+		return 0;
+	}
+
+	m = display->driver->get_update_mode(display);
 
 	switch (m) {
 	case OMAP_DSS_UPDATE_DISABLED: