[ALSA] Add description about spdif_aclink option for snd-intel8x0

Added a description about spdif_aclink option for snd-intel8x0 driver
in ALSA-Configuration.txt.

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