ASoC: dt-bindings: nau8822: Add #sound-dai-cells

Add #sound-dai-cells property and reference dai-common.yaml schema, this
is required since NAU8822 can be used as a platform DAI link.

Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230719124752.248898-2-francesco@dolcini.it


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