gpio: mc33880: Include the right header

This is a driver so only include <linux/gpio/driver.h>.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-mc33880.c

@@ -24,7 +24,7 @@
 #include <linux/mutex.h>
 #include <linux/spi/spi.h>
 #include <linux/spi/mc33880.h>
-#include <linux/gpio.h>
+#include <linux/gpio/driver.h>
 #include <linux/slab.h>
 #include <linux/module.h>