pinctrl: mlxbf3: Add pinctrl driver support

NVIDIA BlueField-3 SoC has a few pins that can be used as GPIOs
or take the default hardware functionality. Add a driver for
the pin muxing.

Signed-off-by: Asmaa Mnebhi <asmaa@nvidia.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20230315215027.30685-3-asmaa@nvidia.com


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