gpio: vx855: Include the right header

This is a GPIO driver so include only <linux/gpio/driver.h>.

Cc: Daniel Drake <drake@endlessm.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-vx855.c

@@ -25,7 +25,7 @@
 
 #include <linux/kernel.h>
 #include <linux/module.h>
-#include <linux/gpio.h>
+#include <linux/gpio/driver.h>
 #include <linux/slab.h>
 #include <linux/device.h>
 #include <linux/platform_device.h>