gpio: mockup: drop unneeded dependencies from Kconfig

The testing module doesn't need GPIO irqchip nor does it depend on
sysfs. Remove unnecessary dependencies from Kconfig.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

drivers/gpio/Kconfig

@@ -332,9 +332,7 @@ config GPIO_MM_LANTIQ
 
 config GPIO_MOCKUP
 	tristate "GPIO Testing Driver"
-	depends on GPIOLIB && SYSFS
-	select GPIO_SYSFS
-	select GPIOLIB_IRQCHIP
+	depends on GPIOLIB
 	select IRQ_SIM
 	help
 	  This enables GPIO Testing driver, which provides a way to test GPIO