pinctrl: ocelot: add support for lan969x SoC pinctrl

This adds support for lan969x SoC pinctrl, reusing the existing ocelot
driver. There are 66 General Purpose I/O pins that are individually
configurable to multiple interfaces.

Signed-off-by: Daniel Machon <daniel.machon@microchip.com>
Link: https://lore.kernel.org/20240917-lan969x-pinctrl-v2-2-ea02cbc56831@microchip.com


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>