ALSA: lola: Remove unused lola_(save|restore)_mixer

lola_restore_mixer() and lola_save_mixer() were added in 2011 by
commit d43f3010 ("ALSA: Add the driver for Digigram Lola
PCI-e boards")
but have remain unused.

Remove them.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Link: https://patch.msgid.link/20250122022059.456068-1-linux@treblig.org


Signed-off-by: Takashi Iwai <tiwai@suse.de>