[ALSA] ac97 - add the 'Mic Front Input Switch' control (ALC850)

AC97 Codec
Add the 'Mic Front Input Switch' control to the mixer for ALC850.
Enabling this input is required for using the front panel microphone
connector with ASUS A8V motherboard.
Signed-off-by: NSergey Vlasov <vsu@altlinux.ru>
Signed-off-by: NJaroslav Kysela <perex@suse.cz>

sound/pci/ac97/ac97_patch.c

@@ -1928,6 +1928,7 @@ static void alc850_update_jacks(ac97_t *ac97)
 
 static const snd_kcontrol_new_t snd_ac97_controls_alc850[] = {
 	AC97_PAGE_SINGLE("Duplicate Front", AC97_ALC650_MULTICH, 0, 1, 0, 0),
+	AC97_SINGLE("Mic Front Input Switch", AC97_ALC850_JACK_SELECT, 15, 1, 1),
 	AC97_SURROUND_JACK_MODE_CTL,
 	AC97_CHANNEL_MODE_CTL,
 };