This patch converts the resource management in ISA wss driver with
devres as a clean up.  Each manual resource management is converted
with the corresponding devres helper.  Since the whole destructor code
could be removed by the conversion, the lowlevel snd_device was
dropped as well.

This should give no user-visible functional changes.

Link: https://lore.kernel.org/r/20210715075941.23332-54-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>