gpio: mm-lantiq: Include the right header

This is a driver so include only <linux/gpio/driver.h>.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-mm-lantiq.c

@@ -11,7 +11,7 @@
 #include <linux/types.h>
 #include <linux/platform_device.h>
 #include <linux/mutex.h>
-#include <linux/gpio.h>
+#include <linux/gpio/driver.h>
 #include <linux/of.h>
 #include <linux/of_gpio.h>
 #include <linux/io.h>