drm/omap: remove unused dispc_wb_enable & dispc_wb_is_enabled

Remove two unused WB functions.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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

@@ -2933,16 +2933,6 @@ static enum omap_dss_output_id dispc_mgr_get_supported_outputs(enum omap_channel
 	return dss_feat_get_supported_outputs(channel);
 }
 
-void dispc_wb_enable(bool enable)
-{
-	dispc_ovl_enable(OMAP_DSS_WB, enable);
-}
-
-bool dispc_wb_is_enabled(void)
-{
-	return dispc_ovl_enabled(OMAP_DSS_WB);
-}
-
 static void dispc_lcd_enable_signal_polarity(bool act_high)
 {
 	if (!dss_has_feature(FEAT_LCDENABLEPOL))

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

@@ -373,8 +373,6 @@ void dispc_set_tv_pclk(unsigned long pclk);
 u32 dispc_wb_get_framedone_irq(void);
 bool dispc_wb_go_busy(void);
 void dispc_wb_go(void);
-void dispc_wb_enable(bool enable);
-bool dispc_wb_is_enabled(void);
 void dispc_wb_set_channel_in(enum dss_writeback_channel channel);
 int dispc_wb_setup(const struct omap_dss_writeback_info *wi,
 		bool mem_to_mem, const struct videomode *vm);