dt-bindings: net: dsa: b53: Add missing size and address cells to example

Add the missing size and address cells to the b53 example. Otherwise, it may not
compile or issue warnings if directly copied into a device tree.

Signed-off-by: Kurt Kanzenbach <[email protected]>
Acked-by: Florian Fainelli <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: shifty91

Documentation/devicetree/bindings/net/dsa/b53.txt

@@ -110,6 +110,9 @@ Ethernet switch connected via MDIO to the host, CPU port wired to eth0:
 			#size-cells = <0>;
 
 			ports {
+				#address-cells = <1>;
+				#size-cells = <0>;
+
 				port0@0 {
 					reg = <0>;
 					label = "lan1";