dt-bindings: memory: tegra210: emc: Document OPP table and interconnect

These are needed for dynamic frequency scaling of the EMC controller.

Signed-off-by: Aaron Kling <[e-mail]>
Signed-off-by: Krzysztof Kozlowski <[e-mail]>

Documentation/devicetree/bindings/memory-controllers/nvidia,tegra210-emc.yaml

···
     items:
       - description: EMC general interrupt
 
+  "#interconnect-cells":
+    const: 0
+
   memory-region:
     maxItems: 1
     description:
···
     $ref: /schemas/types.yaml#/definitions/phandle
     description:
       phandle of the memory controller node
+
+  operating-points-v2:
+    description:
+      Should contain freqs and voltages and opp-supported-hw property, which
+      is a bitfield indicating SoC speedo ID mask.
 
 required:
   - compatible
···
         interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
         memory-region = <&emc_table>;
         nvidia,memory-controller = <&mc>;
+        operating-points-v2 = <&dvfs_opp_table>;
+
+        #interconnect-cells = <0>;
     };