media: mt9m111: Drop unused include

This driver includes <linux/gpio.h> but does not use any
symbols from this file. Drop the include.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>

drivers/media/i2c/mt9m111.c

@@ -9,7 +9,6 @@
 #include <linux/slab.h>
 #include <linux/i2c.h>
 #include <linux/log2.h>
-#include <linux/gpio.h>
 #include <linux/delay.h>
 #include <linux/regulator/consumer.h>
 #include <linux/v4l2-mediabus.h>