ARM: shmobile: kzm9g-reference: add ethernet support

Add a DT node for the SMSC 9221 ethernet chip, found on kzm9g, to its
reference implementation.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/sh73a0-kzm9g-reference.dts

@@ -44,6 +44,19 @@
 		regulator-always-on;
 		regulator-boot-on;
 	};
+
+	lan9220@10000000 {
+		compatible = "smsc,lan9220", "smsc,lan9115";
+		reg = <0x10000000 0x100>;
+		phy-mode = "mii";
+		interrupt-parent = <&irqpin0>;
+		interrupts = <3 0>;	/* active low */
+		reg-io-width = <4>;
+		smsc,irq-push-pull;
+		smsc,save-mac-address;
+		vddvario-supply = <&reg_1p8v>;
+		vdd33a-supply = <&reg_3p3v>;
+	};
 };
 
 &mmcif {