bmips: dts: dgnd3700: fix WAN port

All switch ports are labeled as port@address so let's follow the same pattern.

Fixes: ed79519b8d89 ("bmips: add support for Netgear DGND3700 v1, DGND3800B")
Signed-off-by: Álvaro Fernández Rojas <[email protected]>

target/linux/bmips/dts/bcm6368-netgear-dgnd3700.dtsi

@@ -123,7 +123,7 @@
 			#address-cells = <1>;
 			#size-cells = <0>;
 
-			wan@0 {
+			port@0 {
 				reg = <0>;
 				label = "wan";
 			};