ASoC: midas-audio: Correct parsing sound-dai phandles

ASoC: midas-audio: Correct parsing sound-dai phandles

The "sound-dai" property has cells therefore phandle-array should be
used, even if it is just one phandle.  This fixes dtbs_check warnings
like:

  arch/arm/boot/dts/exynos4412-trats2.dt.yaml: sound: cpu:sound-dai:0:1: missing phandle tag in 0
  arch/arm/boot/dts/exynos4412-trats2.dt.yaml: sound: cpu:sound-dai:0: [158, 0] is too long

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Link: https://lore.kernel.org/r/20200830112633.6732-1-krzk@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>