[ALSA] hda-codec - Add support for VIA VT1708B HD audio codec

This patch adds support for VIA new HD audio codec, VT1708B.
Signed-off-by: NJosepch Chan <josephchan@via.com.tw>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>
Signed-off-by: NJaroslav Kysela <perex@perex.cz>