gpio: sta2x11: Include the right header

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

Cc: Bartosz Golaszewski <brgl@bgdev.pl>
Acked-by: Alessandro Rubini <rubini@gnudd.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-sta2x11.c

@@ -23,7 +23,7 @@
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
-#include <linux/gpio.h>
+#include <linux/gpio/driver.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/pci.h>