ARM: dts: uniphier: Add ethernet aliases

Add an 'aliases' property for ethernet device.

U-Boot performs a fix-up of the MAC address and will overwrite the values
from the Linux devicetree for aliased ethernet device. The MAC address can
be inherited from U-Boot by adding aliases of ethernet devices.
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

arch/arm/boot/dts/uniphier-ld6b-ref.dts

@@ -29,6 +29,7 @@ aliases {
 		i2c4 = &i2c4;
 		i2c5 = &i2c5;
 		i2c6 = &i2c6;
+		ethernet0 = ð
 	};
 
 	memory@80000000 {

arch/arm/boot/dts/uniphier-pro4-ace.dts

@@ -26,6 +26,7 @@ aliases {
 		i2c3 = &i2c3;
 		i2c5 = &i2c5;
 		i2c6 = &i2c6;
+		ethernet0 = ð
 	};
 
 	memory@80000000 {

arch/arm/boot/dts/uniphier-pro4-ref.dts

@@ -29,6 +29,7 @@ aliases {
 		i2c3 = &i2c3;
 		i2c5 = &i2c5;
 		i2c6 = &i2c6;
+		ethernet0 = ð
 	};
 
 	memory@80000000 {

arch/arm/boot/dts/uniphier-pro4-sanji.dts

@@ -25,6 +25,7 @@ aliases {
 		i2c3 = &i2c3;
 		i2c5 = &i2c5;
 		i2c6 = &i2c6;
+		ethernet0 = ð
 	};
 
 	memory@80000000 {

arch/arm/boot/dts/uniphier-pxs2-gentil.dts

@@ -26,6 +26,7 @@ aliases {
 		i2c4 = &i2c4;
 		i2c5 = &i2c5;
 		i2c6 = &i2c6;
+		ethernet0 = ð
 	};
 
 	memory@80000000 {

arch/arm/boot/dts/uniphier-pxs2-vodka.dts

@@ -24,6 +24,7 @@ aliases {
 		i2c4 = &i2c4;
 		i2c5 = &i2c5;
 		i2c6 = &i2c6;
+		ethernet0 = ð
 	};
 
 	memory@80000000 {