pinctrl: axp209: add missing Kconfig dependencies

This fixes some compilation issues.

GENERIC_PINCONF and OF at least for pinconf_generic_dt_*, PINMUX at
least for pinmux_ops and GPIOLIB for at least gpio_chip.

Fixes: 23f75d7d ("pinctrl: axp209: add pinctrl features")
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/Kconfig

@@ -66,6 +66,10 @@ config PINCTRL_AS3722
 config PINCTRL_AXP209
 	tristate "X-Powers AXP209 PMIC pinctrl and GPIO Support"
 	depends on MFD_AXP20X
+	depends on OF
+	select PINMUX
+	select GENERIC_PINCONF
+	select GPIOLIB
 	help
 	  AXP PMICs provides multiple GPIOs that can be muxed for different
 	  functions. This driver bundles a pinctrl driver to select the function