ALSA: hda - Add expose_enum_ctl flag to snd_hda_add_vmaster_hook()

Since it's not always safe to assume that the vmaster hook is purely the
mute-LED control, add the flag indicating whether to expose the mute-LED
enum control or not.  Currently, conexant codec sets this off for non-HP
laptops where EAPD may be used really as EAPD.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index b981ea9..7a8fcc4 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -2508,7 +2508,8 @@
  * the given hook.
  */
 int snd_hda_add_vmaster_hook(struct hda_codec *codec,
-			     struct hda_vmaster_mute_hook *hook)
+			     struct hda_vmaster_mute_hook *hook,
+			     bool expose_enum_ctl)
 {
 	struct snd_kcontrol *kctl;
 
@@ -2517,6 +2518,8 @@
 	snd_ctl_add_vmaster_hook(hook->sw_kctl, hook->hook, codec);
 	hook->codec = codec;
 	hook->mute_mode = HDA_VMUTE_FOLLOW_MASTER;
+	if (!expose_enum_ctl)
+		return 0;
 	kctl = snd_ctl_new1(&vmaster_mute_mode, hook);
 	if (!kctl)
 		return -ENOMEM;