ALSA: HDA patch_via.c: Add VT1708S and VT1702 support

The VT1702 and VT1708S codecs are new HDA codecs by VIA.

This patch adds support for them to the patch_via.c file for HDA
Signed-off-by: NHarald Welte <HaraldWelte@viatech.com>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>
Signed-off-by: NJaroslav Kysela <perex@perex.cz>