arm64: dts: renesas: rzg2ul-smarc-som: Add PHY interrupt support for ETH{0/1}

The PHY interrupt (INT_N) pin is connected to IRQ2 and IRQ7 for ETH0 and
ETH1 respectively.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20230102221815.273719-7-prabhakar.mahadev-lad.rj@bp.renesas.com


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