ARM: dts: BCM5310x: Enable switch ports on SmartRG SR400AC

Define the port mapping for the SmartRG SR400ACE device.
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

arch/arm/boot/dts/bcm4708-smartrg-sr400ac.dts

@@ -126,3 +126,43 @@ &uart0 {
 &spi_nor {
 	status = "okay";
 };
+
+&srab {
+	status = "okay";
+
+	ports {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		port@0 {
+			reg = <0>;
+			label = "lan4";
+		};
+
+		port@1 {
+			reg = <1>;
+			label = "lan3";
+		};
+
+		port@2 {
+			reg = <2>;
+			label = "lan2";
+		};
+
+		port@3 {
+			reg = <3>;
+			label = "lan1";
+		};
+
+		port@4 {
+			reg = <4>;
+			label = "wan";
+		};
+
+		port@5 {
+			reg = <5>;
+			label = "cpu";
+			ethernet = <&gmac0>;
+		};
+	};
+};