ALSA: hda - Fix missing capture mixer for ALC861/660 codecs

The capture-related mixer elements are missing with ALC861/ALC660 codecs
when quirks are present, due to missing call of set_capture_mixer().

Reference: Novell bnc#567340
	http://bugzilla.novell.com/show_bug.cgi?id=567340

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Cc: <stable@kernel.org>
diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index 11b989b..abae100 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -14879,6 +14879,8 @@
 	spec->stream_digital_playback = &alc861_pcm_digital_playback;
 	spec->stream_digital_capture = &alc861_pcm_digital_capture;
 
+	if (!spec->cap_mixer)
+		set_capture_mixer(codec);
 	set_beep_amp(spec, 0x23, 0, HDA_OUTPUT);
 
 	spec->vmaster_nid = 0x03;