alsa: add lower rate bound for DSD playback
This prevents errors when trying to play at a rate that's lower than DSD64 (the lowest rate available).
Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
This prevents errors when trying to play at a rate that's lower than DSD64 (the lowest rate available).