gpio: gpiolib-of: Allow compile testing

Lower dependencies for compile testing.
Signed-off-by: Alexander Stein <alexanders83@web.de>

drivers/gpio/Kconfig

@@ -49,7 +49,7 @@ config GPIO_DEVRES
 
 config OF_GPIO
 	def_bool y
-	depends on OF
+	depends on OF || COMPILE_TEST
 
 config GPIO_ACPI
 	def_bool y