ASoC: codecs: max98090: simplify snd_soc_dai_driver

The max98090 has only one DAI, so snd_soc_dai_driver does not have to be
an array.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230208160410.371609-2-krzysztof.kozlowski@linaro.org


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