ALSA: hda: 92xx S/PDIF In support

Add support for S/PDIF IN on reference boards quirks. Also disable the
IEC958 capture switch on boards with GPIO0 enabled.

Signed-off-by: Matthew Ranostay <mranostay@embeddedalley.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>