I think your driver is already in armbian, but your chip is not identified. To get it working you can identify it in the ethernet node this way:
 
	 
 
	mdio { 
	            compatible = "snps,dwmac-mdio"; 
	            #address-cells = < 0x01 >; 
	            #size-cells = < 0x00 >;
 
	            ethernet-phy@1 { 
	                compatible = "ethernet-phy-ieee802.3-c22"; ====> compatible = "ethernet-phy-id7b74.4411", "ethernet-phy-ieee802.3-c22";