pinctrl: renesas: Add RZ/V2M pin and gpio controller driver

Add support for pin and gpio controller driver for RZ/V2M SoC.
Based on the RZ/G2L driver.

Note that the DETDO and DETMS dedicated pins are currently not
documented in the HW manual as to which pin group they are in.
HW team has since said that the output level of 1.8V I/O group 4
(for MD0-7, and debugger) is the same as the 1.8V I/O group 3.

Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/20220624084833.22605-3-phil.edworthy@renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>