gpio: timberdale: Include the right header

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

Cc: Richard Röjfors <richard.rojfors@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-timberdale.c

@@ -22,7 +22,7 @@
  */
 
 #include <linux/init.h>
-#include <linux/gpio.h>
+#include <linux/gpio/driver.h>
 #include <linux/platform_device.h>
 #include <linux/irq.h>
 #include <linux/io.h>