arm64: dts: renesas: r9a09g087: Add GPIO IRQ support
The Renesas RZ/N2H (R9A09G087) SoC includes pins which can be routed via
the ICU to generate interrupts.
Add support for using the pin controller as an interrupt chip.
Signed-off-by: Cosmin Tanislav <cosmin-gabriel.tanislav.xa@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20251205150234.2958140-7-cosmin-gabriel.tanislav.xa@renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>