soc: renesas: rz-sysc: Add SoC identification for RZ/V2N SoC

soc: renesas: rz-sysc: Add SoC identification for RZ/V2N SoC

Add SoC identification for the RZ/V2N SoC using the System Controller
(SYS) block.

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/20250415085438.83856-1-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>