dt-bindings: misc: qcom,fastrpc: Compute callbacks can be DMA coherent

Apparently on Qualcomm SM8550 and SM8650 the FastRPC compute callbacks
are DMA coherent:

  sm8650-qrd.dtb: fastrpc: compute-cb@2: 'dma-coherent' does not match any of the regexes: 'pinctrl-[0-9]+'
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20240212110827.59302-1-krzysztof.kozlowski@linaro.orgSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml

@@ -77,6 +77,8 @@ patternProperties:
       reg:
         maxItems: 1
 
+      dma-coherent: true
+
       iommus:
         minItems: 1
         maxItems: 3