arm: socfpga: stratix10: Add alias for gmac0 in S10 dts

Add 'ethernet0' as alias for 'gmac0' in S10 device tree.

Signed-off-by: Chee Hong Ang <chee.hong.ang@intel.com>
Signed-off-by: Ooi, Joyce <joyce.ooi@intel.com>
Reviewed-by: Ley Foon Tan <ley.foon.tan@intel.com>

arch/arm/dts/socfpga_stratix10_socdk.dts

@@ -9,6 +9,7 @@
 	model = "SoCFPGA Stratix 10 SoCDK";
 
 	aliases {
+		ethernet0 = &gmac0;
 		i2c0 = &i2c1;
 		serial0 = &uart0;
 	};