ALSA: korg1212: Allocate resources with device-managed APIs

This patch converts the resource management in PCI korg1212 driver
with devres as a clean up.  Each manual resource management is
converted with the corresponding devres helper, the page allocations
are done with the devres helper, and the card object release is
managed now via card->private_free instead of a lowlevel snd_device.

This should give no user-visible functional changes.

Link: https://lore.kernel.org/r/20210715075941.23332-40-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>