arm64: dts: renesas: rzg2l-smarc-som: Enable Ethernet

Enable Ethernet{0,1} interfaces on RZ/G2L SMARC EVK.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://lore.kernel.org/r/20211013075647.32231-3-biju.das.jz@bp.renesas.com


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>