ALSA: hdspm - AIO: Drop superfluous HDSPM_AUTOSYNC_REF

The HDSPM_AUTOSYNC_REF macro is only implemented for MADI and AES32
cards, so it doesn't make sense to call it on AIO boards.

Signed-off-by: Adrian Knoth <adi@drcomp.erfurt.thur.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>