Enable gmac2 on the Agilex5 SOCFGPA Development Kit. The MAC is connected to a RGMII PHY on a daughter card. There are no RGMII clock delays implemented the on PCB. Signed-off-by: Matthew Gerlach <matthew.gerlach@altera.com> Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>