OMAPDSS: DISPC: rename dispc_mgr_enable/disable to _sync

The current dispc_mgr_enable/disable function are blocking, and do a bit
too much for omapdrm. We'll expose new enable & disable functions that
will just set the bits in the registers in the following patches.

This patch renames the current functions to *_sync, to make it clear
that they are blocking, and also to free up the dispc_mgr_enable/disable
names for these new functions.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/video/omap2/dss/dispc.c

@@ -2755,7 +2755,7 @@ static void dispc_mgr_disable_digit_out(void)
 		DSSERR("failed to unregister %x isr\n", irq_mask);
 }
 
-void dispc_mgr_enable(enum omap_channel channel)
+void dispc_mgr_enable_sync(enum omap_channel channel)
 {
 	if (dss_mgr_is_lcd(channel))
 		dispc_mgr_enable_lcd_out(channel);
@@ -2765,7 +2765,7 @@ void dispc_mgr_enable(enum omap_channel channel)
 		WARN_ON(1);
 }
 
-void dispc_mgr_disable(enum omap_channel channel)
+void dispc_mgr_disable_sync(enum omap_channel channel)
 {
 	if (dss_mgr_is_lcd(channel))
 		dispc_mgr_disable_lcd_out(channel);