[ALSA] hda-codec - Fix SPDIF device number of ALC codecs

Assign the SPDIF always to the secondary device (dev#1) to keep
the same configuration.  Move the optional capture device to the
third device (dev#2).
hda_intel now just ignores the NULL entries in the pcm arrays
from codecs.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>