pinctrl: nuvoton: Constify wpcm450_groups

There is no modifications are assumed for wpcm450_groups. Constify it.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20231211154239.4190429-1-andriy.shevchenko@linux.intel.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/nuvoton/pinctrl-wpcm450.c

@@ -474,7 +474,7 @@ enum {
 #undef WPCM450_GRP
 };
 
-static struct pingroup wpcm450_groups[] = {
+static const struct pingroup wpcm450_groups[] = {
 #define WPCM450_GRP(x) PINCTRL_PINGROUP(#x, x ## _pins, ARRAY_SIZE(x ## _pins))
 	WPCM450_GRPS
 #undef WPCM450_GRP