OMAP: DSS2: move get_resolution()

Move get_resolution() 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/displays/panel-taal.c b/drivers/video/omap2/displays/panel-taal.c
index 8f90de0..11d69b6 100644
--- a/drivers/video/omap2/displays/panel-taal.c
+++ b/drivers/video/omap2/displays/panel-taal.c
@@ -517,7 +517,6 @@
 	dev_set_drvdata(&dssdev->dev, td);
 
 	dssdev->get_timings = taal_get_timings;
-	dssdev->get_resolution = taal_get_resolution;
 
 	/* if no platform set_backlight() defined, presume DSI backlight
 	 * control */
@@ -990,6 +989,7 @@
 	.resume		= taal_resume,
 
 	.setup_update	= taal_setup_update,
+	.get_resolution	= taal_get_resolution,
 	.enable_te	= taal_enable_te,
 	.wait_for_te	= taal_wait_te,
 	.set_rotate	= taal_rotate,