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";