drivers: pinctrl: Add support for RZ/V2L

This is the initial commit to support pinctrl driver for Renesas RZ/V2L

Signed-off-by: Quang Le <quang.le.eb@bp.renesas.com>
Signed-off-by: Hieu Nguyen <hieu.nguyen.ym@bp.renesas.com>
Signed-off-by: Nhut Nguyen <nhut.nguyen.kc@renesas.com>