gpio/pinctrl: ingenic: depend on OF

Fix compile errors due to missing OF.

Cc: Paul Cercueil <paul@crapouillou.net>
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 64bc995..395c85d 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -244,6 +244,7 @@
 
 config GPIO_INGENIC
 	tristate "Ingenic JZ47xx SoCs GPIO support"
+	depends on OF
 	depends on MACH_INGENIC || COMPILE_TEST
 	select GPIOLIB_IRQCHIP
 	help