ASoC: dt-bindings: nau8822: convert to the dtschema

Convert nau8822 devicetree binding to dtschema.
Change file name to match dtschema naming.

Cc: David Lin <CTLIN0@nuvoton.com>
Signed-off-by: Emanuele Ghidoli <emanuele.ghidoli@toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230104140412.35575-2-francesco@dolcini.it


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