dt-bindings: dma: qcom,bam: Document dma-coherent property

Qualcomm BAM DMA controller has DMA-coherent support so define it in the
properties section.

Acked-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Kaushal Kumar <quic_kaushalk@quicinc.com>
Link: https://lore.kernel.org/r/20250423063054.28795-3-quic_kaushalk@quicinc.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: kaushalk-quic

Documentation/devicetree/bindings/dma/qcom,bam-dma.yaml

@@ -42,6 +42,8 @@ properties:
   interrupts:
     maxItems: 1
 
+  dma-coherent: true
+
   iommus:
     minItems: 1
     maxItems: 6