gpio: zevio: 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-zevio.c

@@ -16,7 +16,7 @@
 #include <linux/of_device.h>
 #include <linux/of_gpio.h>
 #include <linux/slab.h>
-#include <linux/gpio.h>
+#include <linux/gpio/driver.h>
 
 /*
  * Memory layout: