ASoC: dt-bindings: Add FSD I2S controller bindings

Add bindings for FSD CPU DAI driver which supports stereo channel
audio playback and capture on FSD platform.

Signed-off-by: Padmanabhan Rajanbabu <p.rajanbabu@samsung.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230116103823.90757-2-p.rajanbabu@samsung.com


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