ALSA: HDA: Fix mic initialization in VIA auto parser

This typo caused some microphone inputs not to be correctly
initialized on VIA codecs.

Reported-By: Mark Goldstein <goldstein.mark@gmail.com>
Cc: stable@kernel.org
Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>