[ALSA] hda: Add dynamic mono mixer support for STAC92xx codecs

Allows for dynamically creating mono out mixer controls and well
as mono mux controls.

Signed-off-by: Matthew Ranostay <mranostay@embeddedalley.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
diff --git a/sound/pci/hda/hda_local.h b/sound/pci/hda/hda_local.h
index 8a96047d..ad0014a 100644
--- a/sound/pci/hda/hda_local.h
+++ b/sound/pci/hda/hda_local.h
@@ -375,6 +375,7 @@
 	return codec->wcaps[nid - codec->start_nid];
 }
 
+u32 query_amp_caps(struct hda_codec *codec, hda_nid_t nid, int direction);
 int snd_hda_override_amp_caps(struct hda_codec *codec, hda_nid_t nid, int dir,
 			      unsigned int caps);