dt-bindings: usb: tegra-xudc: Add dma-coherent for Tegra194

DMA operations for XUSB device controller are coherent for Tegra194 and
so update the device-tree binding to add this property.

Signed-off-by: Jon Hunter <[e-mail]>
Acked-by: Thierry Reding <[e-mail]>
Acked-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

Documentation/devicetree/bindings/usb/nvidia,tegra-xudc.yaml

···
   hvdd-usb-supply:
     description: USB controller power supply. Must supply 3.3 V.
 
+  dma-coherent: true
+
 required:
   - compatible
   - reg
···
           maxItems: 4
         clock-names:
           maxItems: 4
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - nvidia,tegra194-xudc
+    then:
+      required:
+        - dma-coherent
 
 additionalProperties: false