ASoC: arizona: Add noise gate hold time enumeration

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/codecs/arizona.h b/sound/soc/codecs/arizona.h
index 41dae1e..3d083d0 100644
--- a/sound/soc/codecs/arizona.h
+++ b/sound/soc/codecs/arizona.h
@@ -176,6 +176,8 @@
 extern const struct soc_enum arizona_lhpf3_mode;
 extern const struct soc_enum arizona_lhpf4_mode;
 
+extern const struct soc_enum arizona_ng_hold;
+
 extern int arizona_in_ev(struct snd_soc_dapm_widget *w,
 			 struct snd_kcontrol *kcontrol,
 			 int event);