ASoC: amd: vangogh: Move nau8821 and CPU side code up for future platform

Move nau8821 and CPU side code up in the source so future platforms can
be added.

Signed-off-by: Lucas Tanure <lucas.tanure@collabora.com>
Link: https://lore.kernel.org/r/20230217110850.1045250-8-lucas.tanure@collabora.com


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