Use 6STACK_DIG for the AD2000BX variant of the AD1989B chip used by Asus
on their Asus P5Q Premium and Pro boards.
Signed-off-by: NRobin H. Johnson <robbat2@gentoo.org>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>
Signed-off-by: NJaroslav Kysela <perex@perex.cz>