gpio: vr41xx: Include the right header

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

Cc: Yoichi Yuasa <yuasa@linux-mips.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-vr41xx.c

@@ -21,7 +21,7 @@
  */
 #include <linux/errno.h>
 #include <linux/fs.h>
-#include <linux/gpio.h>
+#include <linux/gpio/driver.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>