dt-bindings: pinctrl: renesas: Document RZ/G3E SoC

dt-bindings: pinctrl: renesas: Document RZ/G3E SoC

Add documentation for the pin controller found on the Renesas RZ/G3E
(R9A09G047) SoC. The RZ/G3E PFC is similar to the RZ/V2H SoC but has more
pins(P00-PS3).

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/20241216195325.164212-3-biju.das.jz@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>