arm64: dts: renesas: rzg2lc-smarc-som: Add PHY interrupt support for ETH0

The PHY interrupt (INT_N) pin is connected to IRQ0 for ETH0.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20230712151153.81965-1-biju.das.jz@bp.renesas.com


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