dt-bindings: dmaengine: qcom: gpi: Allow dma-coherent

On SM8550, the GPI DMA controller is coherent with the CPU.
Allow specifying that.
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230830-topic-8550_dmac2-v1-1-49bb25239fb1@linaro.orgSigned-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/dma/qcom,gpi.yaml

@@ -69,6 +69,8 @@ properties:
   dma-channel-mask:
     maxItems: 1
 
+  dma-coherent: true
+
 required:
   - compatible
   - reg