OMAPDSS: DISPC: make dispc_ovl_set_channel_out() public

Make dispc_ovl_set_channel_out() public so that later patches can handle
changing overlay's manager.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/video/omap2/dss/dispc.c

@@ -875,8 +875,7 @@ static void dispc_ovl_set_color_mode(enum omap_plane plane,
 	REG_FLD_MOD(DISPC_OVL_ATTRIBUTES(plane), m, 4, 1);
 }
 
-static void dispc_ovl_set_channel_out(enum omap_plane plane,
-		enum omap_channel channel)
+void dispc_ovl_set_channel_out(enum omap_plane plane, enum omap_channel channel)
 {
 	int shift;
 	u32 val;

drivers/video/omap2/dss/dss.h

@@ -402,6 +402,8 @@ int dispc_ovl_setup(enum omap_plane plane, struct omap_overlay_info *oi,
 		bool ilace, enum omap_channel channel, bool replication,
 		u32 fifo_low, u32 fifo_high);
 int dispc_ovl_enable(enum omap_plane plane, bool enable);
+void dispc_ovl_set_channel_out(enum omap_plane plane,
+		enum omap_channel channel);
 
 
 void dispc_mgr_enable_fifohandcheck(enum omap_channel channel, bool enable);