ARM: dts: socfgpa: remove ethernet aliases from dtsi

Not all boards use two ethernet devices and/or use them in different
order. As almost all in-tree boards already define their own ethernet
aliases, remove them from the dtsi and add the aliases to the two boards,
that are missing their own definition.

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
[dinguyen@kernel.org: rebased to latest dts changes]
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>

arch/arm/boot/dts/socfpga.dtsi

@@ -22,8 +22,6 @@
 	#size-cells = <1>;
 
 	aliases {
-		ethernet0 = &gmac0;
-		ethernet1 = &gmac1;
 		serial0 = &uart0;
 		serial1 = &uart1;
 		timer0 = &timer0;