soc: renesas: Enable ICU support on RZ/N2H

soc: renesas: Enable ICU support on RZ/N2H

The Renesas RZ/N2H (R9A09G087) SoC has the same Interrupt Controller
(ICU) as the Renesas RZ/T2H (R9A09G077) SoC.

Enable support for it by selecting the RENESAS_RZT2H_ICU config.

Signed-off-by: Cosmin Tanislav <cosmin-gabriel.tanislav.xa@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20251216123421.124401-1-cosmin-gabriel.tanislav.xa@renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>