OMAPDSS: remove dssdev uses in trivial cases

In the future the "dssdev" parameter passed to output drivers will
change its meaning. Instead of being a pointer to the panel device, it's
a pointer to the output instance.

To make the transition easier, some of the uses for this dssdev
parameter can be easily removed.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
diff --git a/drivers/video/omap2/dss/hdmi.c b/drivers/video/omap2/dss/hdmi.c
index 98341fe..86b495c 100644
--- a/drivers/video/omap2/dss/hdmi.c
+++ b/drivers/video/omap2/dss/hdmi.c
@@ -560,7 +560,7 @@
 {
 	int r;
 	struct omap_video_timings *p;
-	struct omap_overlay_manager *mgr = dssdev->output->manager;
+	struct omap_overlay_manager *mgr = hdmi.output.manager;
 	unsigned long phy;
 
 	r = hdmi_power_on_core(dssdev);
@@ -623,7 +623,7 @@
 
 static void hdmi_power_off_full(struct omap_dss_device *dssdev)
 {
-	struct omap_overlay_manager *mgr = dssdev->output->manager;
+	struct omap_overlay_manager *mgr = hdmi.output.manager;
 
 	dss_mgr_disable(mgr);
 
@@ -720,7 +720,7 @@
 
 int omapdss_hdmi_display_enable(struct omap_dss_device *dssdev)
 {
-	struct omap_dss_output *out = dssdev->output;
+	struct omap_dss_output *out = &hdmi.output;
 	int r = 0;
 
 	DSSDBG("ENTER hdmi_display_enable\n");