ASoC: Explicitly disable DC servo on WM hubs headphone powerdown

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
diff --git a/sound/soc/codecs/wm_hubs.c b/sound/soc/codecs/wm_hubs.c
index 16f1a57..2cb8153 100644
--- a/sound/soc/codecs/wm_hubs.c
+++ b/sound/soc/codecs/wm_hubs.c
@@ -410,6 +410,8 @@
 				    WM8993_HPOUT1L_DLY |
 				    WM8993_HPOUT1R_DLY, 0);
 
+		snd_soc_write(codec, WM8993_DC_SERVO_0, 0);
+
 		snd_soc_update_bits(codec, WM8993_POWER_MANAGEMENT_1,
 				    WM8993_HPOUT1L_ENA | WM8993_HPOUT1R_ENA,
 				    0);