ASoC: dt-bindings: ti,pcm1681: Convert to dtschema

Convert the Texas Instruments PCM1681 bindings to DT schema.
Make bindings complete by adding #sound-dai-cells.

Signed-off-by: Animesh Agarwal <animeshagarwal28@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://msgid.link/r/20240406141454.45529-1-animeshagarwal28@gmail.com


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