pinctrl: nuvoton: Fix up Kconfig deps

We have build errors due to missing dependency on OF.
Add the dependency and do it the same way for all three
Nuvotons while we are at it.

Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20230913-novoton-kconfig-v1-1-1c2dff14c0d2@linaro.org