ASoC: dt-bindings: cdns,xtfpga-i2s: Convert to dt-schema

Convert the xtfpga I2S controller plain-text binding documentation
to standard dt-schema.

The hardware requires exactly one memory region, one interrupt line,
and one phandle to the master clock. Verified these constraints against
the driver source in sound/soc/xtensa/xtfpga-i2s.c.

Also explicitly define the '#sound-dai-cells' property, as it is
required for audio routing but was omitted from the original
text properties list.

Reviewed-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chaitanya Sabnis <chaitanya.msabnis@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://patch.msgid.link/20260421085635.4490-1-chaitanya.msabnis@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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