arm64: dts: renesas: rzg2l-smarc-som: Add PHY interrupt support for ETH{0/1}

The PHY interrupt (INT_N) pin is connected to IRQ2 and IRQ3 for ETH0
and ETH1 respectively.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/20220722151155.21100-4-prabhakar.mahadev-lad.rj@bp.renesas.com


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