ASoC: da7213: Add new kcontrol for tonegen

Add new kcontrol for tone generator

Signed-off-by: David Rau <David.Rau.opensource@dm.renesas.com>
Link: https://lore.kernel.org/r/20231018064444.23186-1-David.Rau.opensource@dm.renesas.com


Signed-off-by: Mark Brown <broonie@kernel.org>