pinctrl: nomadik: follow type-system kernel coding conventions

Fix strict checkpatch warnings relative to types. Warning types
addressed:

   WARNING: do not add new typedefs
   WARNING: Prefer 'unsigned int' to bare use of 'unsigned'
   WARNING: static const char * array should probably be static const
            char * const

Total messages before: 1 errors, 40 warnings, 39 checks.
Total messages after:  1 errors,  2 warnings, 38 checks.

Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com>
Link: https://lore.kernel.org/r/20240228-mbly-gpio-v2-11-3ba757474006@bootlin.com


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