ASoC: dt-bindings: tegra: Document interconnects property

Add the interconnects and interconnect-names properties to the bindings
for the sound card on various NVIDIA Tegra based boards. These are used
to describe the device's memory paths to and from memory.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211206154624.229018-1-thierry.reding@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/nvidia,tegra-audio-graph-card.yaml

@@ -44,6 +44,16 @@ properties:
     minItems: 1
     maxItems: 3
 
+  interconnects:
+    items:
+      - description: APE read memory client
+      - description: APE write memory client
+
+  interconnect-names:
+    items:
+      - const: dma-mem # read
+      - const: write
+
   iommus:
     maxItems: 1