pinctrl: wpcm450: select MFD_SYSCON

The pinctrl-wpcm450 driver relies on MFD_SYSCON functionality in order
to find some of its MMIO registers. Select MFD_SYSCON from
PINCTRL_WPCM450 to ensure that it's enabled.

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Link: https://lore.kernel.org/r/20230412185049.3782842-1-j.neuschaefer@gmx.net
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/nuvoton/Kconfig

@@ -11,6 +11,7 @@ config PINCTRL_WPCM450
 	select GPIOLIB
 	select GPIO_GENERIC
 	select GPIOLIB_IRQCHIP
+	select MFD_SYSCON
 	help
 	  Say Y or M here to enable pin controller and GPIO support for
 	  the Nuvoton WPCM450 SoC. This is strongly recommended when