ARM: dts: rockchip: Enable Ethernet on rv1126 Neu2-IO

Rockchip RV1126 has GMAC 10/100/1000M ethernet controller.
Enable ethernet node on Neu2-IO board.

Co-Developed-by: Jagan Teki <jagan@edgeble.ai>
Signed-off-by: Jagan Teki <jagan@edgeble.ai>
Signed-off-by: Anand Moon <anand@edgeble.ai>
Link: https://lore.kernel.org/r/20230111172437.5295-4-anand@edgeble.ai


Signed-off-by: Heiko Stuebner <heiko@sntech.de>