ARM: dts: tango4: Add alias for eth0

http://elinux.org/Device_Tree_Usage#aliases_NodeSigned-off-by: NMarc Gonzalez <marc_gonzalez@sigmadesigns.com>
Signed-off-by: NOlof Johansson <olof@lixom.net>

arch/arm/boot/dts/tango4-vantage-1172.dts

@@ -8,6 +8,7 @@
 
 	aliases {
 		serial = &uart;
+		eth0 = &eth0;
 	};
 
 	memory@80000000 {