arm64: dts: renesas: Add initial support for the RZ/N2H EVK

Add an initial device tree file for the Renesas RZ/N2H Evaluation Board
(EVK).

Signed-off-by: Paul Barker <paul.barker.ct@bp.renesas.com>
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/20250617171957.162145-5-prabhakar.mahadev-lad.rj@bp.renesas.com


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