dt-bindings: usb: tegra-xudc: Document interconnects and iommus properties

Add the interconnects, interconnect-names and iommus properties to the
device tree bindings for the Tegra XUDC controller. These are used to
describe the device's paths to and from memory.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>

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

@@ -59,6 +59,19 @@ properties:
       - const: fs_src
       - const: hs_src
 
+  interconnects:
+    items:
+      - description: memory read client
+      - description: memory write client
+
+  interconnect-names:
+    items:
+      - const: dma-mem # read
+      - const: write
+
+  iommus:
+    maxItems: 1
+
   power-domains:
     items:
       - description: XUSBB(device) power-domain