ASoC: dt-bindings: qcom,q6apm-dai: adjust iommus for SM8550 ADSP

It seems that SM8550 ADSP remote processor uses two IOMMUs.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230206150532.513468-1-krzysztof.kozlowski@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/qcom,q6apm-dai.yaml

@@ -17,7 +17,8 @@ properties:
     const: qcom,q6apm-dais
 
   iommus:
-    maxItems: 1
+    minItems: 1
+    maxItems: 2
 
 required:
   - compatible