ALSA: hda/cs8409: Generalize volume controls

Use amp offsets as indexes for saved volumes.
Remove dependencies on NID inside volume control functions.

Signed-off-by: Lucas Tanure <tanureal@opensource.cirrus.com>
Signed-off-by: Vitaly Rodionov <vitalyr@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20210811185654.6837-13-vitalyr@opensource.cirrus.com


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