arm64: dts: stratix10: add ethernet aliases

Add ethernet<n> alias for all gmacs on the devkit.

---
v2: move ethernet aliases to board file

---
 arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts | 3 +++
 1 file changed, 3 insertions(+)

index 53cf195..3d0db30 100644
@@ -21,6 +21,9 @@
 
 	aliases {
 		serial0 = &uart0;
+		ethernet0 = &gmac0;
+		ethernet1 = &gmac1;
+		ethernet2 = &gmac2;
 	};
 
 	chosen {

2.7.4