dt-bindings: memory: tegra30: mc: Document new interconnect property

Memory controller is interconnected with memory clients and with the
External Memory Controller. Document new interconnect property which
turns memory controller into interconnect provider.

Signed-off-by: Dmitry Osipenko <[e-mail]>
Acked-by: Rob Herring <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Krzysztof Kozlowski <[e-mail]>

Documentation/devicetree/bindings/memory-controllers/nvidia,tegra30-mc.yaml

···
   "#iommu-cells":
     const: 1
 
+  "#interconnect-cells":
+    const: 1
+
 patternProperties:
   "^emc-timings-[0-9]+$":
     type: object
···
   - clock-names
   - "#reset-cells"
   - "#iommu-cells"
+  - "#interconnect-cells"
 
 additionalProperties: false
 
···
 
         #iommu-cells = <1>;
         #reset-cells = <1>;
+        #interconnect-cells = <1>;
 
         emc-timings-1 {
             nvidia,ram-code = <1>;