dt-bindings: pinctrl: renesas: Add alpha-numerical port support for RZ/V2H

RZ/V2H has ports P0-P9 and PA-PB. Add support for defining alpha-numerical
ports in DT using RZV2H_* macros.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/20241216195325.164212-2-biju.das.jz@bp.renesas.com


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