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 <[e-mail]>
Acked-by: Rob Herring <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

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

···
   dma-channel-mask:
     maxItems: 1
 
+  dma-coherent: true
+
 required:
   - compatible
   - reg