dt-bindings: net: ipq8064-mdio: fix warning with new qca8k switch

Fix warning now that we have qca8k switch Documentation using yaml.
Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/net/qcom,ipq8064-mdio.yaml

@@ -51,6 +51,9 @@ examples:
         switch@10 {
             compatible = "qca,qca8337";
             reg = <0x10>;
-            /* ... */
+
+            ports {
+              /* ... */
+            };
         };
     };