[ALSA] hda-codec - Fix front/rear mic inputs on AD1986A codec

Fix the front/rear mic inputs on ASUS M2NPV-VM board with AD1986A
codec chip (3stack model).
Signed-off-by: NAndrea Arcangeli <andrea@suse.de>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>
Signed-off-by: NJaroslav Kysela <perex@suse.cz>

sound/pci/hda/patch_analog.c

@@ -741,8 +741,9 @@ static struct hda_verb ad1986a_init_verbs[] = {
 
 /* additional verbs for 3-stack model */
 static struct hda_verb ad1986a_3st_init_verbs[] = {
- 	/* Mic and line-in selectors */
-	{0x0f, AC_VERB_SET_CONNECT_SEL, 0x2},
+	/* Mic selector, mix C/LFE (backmic) and Mic (frontmic) */
+	{0x0f, AC_VERB_SET_CONNECT_SEL, 0x4},
+ 	/* Line-in selectors */
 	{0x10, AC_VERB_SET_CONNECT_SEL, 0x1},
  	{ } /* end */
 };