Input: colibri-vf50-ts - remove unneeded gpio.h header file

The touchscreen device is a GPIO consumer, not a GPIO controller,
so there is no need to include <linux/gpio.h>.

Remove the unneeded header file.
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Link: https://lore.kernel.org/r/20191026185958.24158-1-festevam@gmail.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/touchscreen/colibri-vf50-ts.c

@@ -9,7 +9,6 @@
 
 #include <linux/delay.h>
 #include <linux/err.h>
-#include <linux/gpio.h>
 #include <linux/gpio/consumer.h>
 #include <linux/iio/consumer.h>
 #include <linux/iio/types.h>