ALSA: hdspm - Use snd_ctl_enum_info() for texts_autosync

Also use snd_ctl_enum_info() to fill the autosync enumerated controls.

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