Update the driver to use the new ASoC core control notify helper.
This also fixes a bug where the control would not be found if the
CODEC was given a name prefix.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com
Link: https://lore.kernel.org/r/20230512122838.243002-4-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org