[ALSA] Clean up with common snd_ctl_boolean_*_info callbacks

Clean up codes using the new common snd_ctl_boolean_*_info() callbacks.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index f87f8f0..a05db2f 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -1129,15 +1129,7 @@
 	return change;
 }
 
-static int snd_hda_spdif_out_switch_info(struct snd_kcontrol *kcontrol,
-					 struct snd_ctl_elem_info *uinfo)
-{
-	uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
-	uinfo->count = 1;
-	uinfo->value.integer.min = 0;
-	uinfo->value.integer.max = 1;
-	return 0;
-}
+#define snd_hda_spdif_out_switch_info	snd_ctl_boolean_mono_info
 
 static int snd_hda_spdif_out_switch_get(struct snd_kcontrol *kcontrol,
 					struct snd_ctl_elem_value *ucontrol)