gpio: stp-xway: Include the right header

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

Signed-off-by: Linus Walleij <[e-mail]>

drivers/gpio/gpio-stp-xway.c

···
 #include <linux/types.h>
 #include <linux/of_platform.h>
 #include <linux/mutex.h>
-#include <linux/gpio.h>
+#include <linux/gpio/driver.h>
 #include <linux/io.h>
-#include <linux/of_gpio.h>
 #include <linux/clk.h>
 #include <linux/err.h>