pinctrl: canaan: Add support for k230 SoC

Configuration of the K230 is similar to that of the K210. However, in
K210, the 256 functions for each pin are shared, whereas in K230,
multiplex functions are different for every pin.

`drv_data` of `pinctrl_pin_desc` is pointing to currently activated
group, which is used to print the name of current function of pin in
`pin_dbg_show` and will be updated in `set_mux`, so they are not set
const.

Signed-off-by: Ze Huang <18771902331@163.com>
Link: https://lore.kernel.org/20240926-k230-pinctrl-v2-2-a9a36fba4b34@163.com


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