Add support for the 24-bit audio I/Os of the Edirol SD-90 interface.
Reported-any-tested-by: NJim Grusendorf <alsa-user@grusendorf.ca>
Signed-off-by: NClemens Ladisch <clemens@ladisch.de>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>