drm/omap: convert dss_mgr_start_update to accept omap_channel

We are removing uses of 'struct omap_overlay_manager'. This patch
changes dss_mgr_start_update() to accept 'enum omap_channel' instead of
'struct omap_overlay_manager'.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/gpu/drm/omapdrm/dss/dsi.c

@@ -3982,7 +3982,7 @@ static void dsi_update_screen_dispc(struct platform_device *dsidev)
 
 	dss_mgr_set_timings(mgr->id, &dsi->timings);
 
-	dss_mgr_start_update(mgr);
+	dss_mgr_start_update(mgr->id);
 
 	if (dsi->te_enabled) {
 		/* disable LP_RX_TO, so that we can receive TE.  Time to wait

drivers/gpu/drm/omapdrm/dss/omapdss.h

@@ -92,7 +92,7 @@ void dss_mgr_set_lcd_config(enum omap_channel channel,
 		const struct dss_lcd_mgr_config *config);
 int dss_mgr_enable(enum omap_channel channel);
 void dss_mgr_disable(enum omap_channel channel);
-void dss_mgr_start_update(struct omap_overlay_manager *mgr);
+void dss_mgr_start_update(enum omap_channel channel);
 int dss_mgr_register_framedone_handler(struct omap_overlay_manager *mgr,
 		void (*handler)(void *), void *data);
 void dss_mgr_unregister_framedone_handler(struct omap_overlay_manager *mgr,

drivers/gpu/drm/omapdrm/dss/output.c

@@ -228,9 +228,9 @@ void dss_mgr_disable(enum omap_channel channel)
 }
 EXPORT_SYMBOL(dss_mgr_disable);
 
-void dss_mgr_start_update(struct omap_overlay_manager *mgr)
+void dss_mgr_start_update(enum omap_channel channel)
 {
-	dss_mgr_ops->start_update(mgr->id);
+	dss_mgr_ops->start_update(channel);
 }
 EXPORT_SYMBOL(dss_mgr_start_update);