ASoC: intel, keembay-i2s: Fix a dt_binding_check warning

The property "dmas" contains two items: DMA "TX" and "RX" channel,
Therefore, its value also needs to be written in two parts.

Otherwise, below YAML check warning is reported:
Documentation/devicetree/bindings/sound/intel,keembay-i2s.example.dt.yaml:\
i2s@20140000: dmas: [[4294967295, 29, 4294967295, 33]] is too short
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210329081435.2200-1-thunder.leizhen@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/intel,keembay-i2s.yaml

@@ -81,6 +81,6 @@ examples:
          interrupts = <GIC_SPI 120 IRQ_TYPE_LEVEL_HIGH>;
          clock-names = "osc", "apb_clk";
          clocks = <&scmi_clk KEEM_BAY_PSS_AUX_I2S3>, <&scmi_clk KEEM_BAY_PSS_I2S3>;
-         dmas = <&axi_dma0 29 &axi_dma0 33>;
+         dmas = <&axi_dma0 29>, <&axi_dma0 33>;
          dma-names = "tx", "rx";
      };