[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: Andrea Arcangeli <andrea@suse.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>