iio: st: Drop GPIO include

None of the ST sensor drivers use any symbols from
<linux/gpio.h>, just drop the include from all of them.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
diff --git a/drivers/iio/accel/st_accel_core.c b/drivers/iio/accel/st_accel_core.c
index 2e37f8a..7b83764 100644
--- a/drivers/iio/accel/st_accel_core.c
+++ b/drivers/iio/accel/st_accel_core.c
@@ -15,7 +15,6 @@
 #include <linux/types.h>
 #include <linux/interrupt.h>
 #include <linux/i2c.h>
-#include <linux/gpio.h>
 #include <linux/irq.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
diff --git a/drivers/iio/gyro/st_gyro_core.c b/drivers/iio/gyro/st_gyro_core.c
index c0acbb5..57be68b 100644
--- a/drivers/iio/gyro/st_gyro_core.c
+++ b/drivers/iio/gyro/st_gyro_core.c
@@ -14,7 +14,6 @@
 #include <linux/types.h>
 #include <linux/interrupt.h>
 #include <linux/i2c.h>
-#include <linux/gpio.h>
 #include <linux/irq.h>
 #include <linux/delay.h>
 #include <linux/iio/iio.h>
diff --git a/drivers/iio/magnetometer/st_magn_core.c b/drivers/iio/magnetometer/st_magn_core.c
index a3a268e..e68184a 100644
--- a/drivers/iio/magnetometer/st_magn_core.c
+++ b/drivers/iio/magnetometer/st_magn_core.c
@@ -14,7 +14,6 @@
 #include <linux/types.h>
 #include <linux/interrupt.h>
 #include <linux/i2c.h>
-#include <linux/gpio.h>
 #include <linux/irq.h>
 #include <linux/delay.h>
 #include <linux/iio/iio.h>
diff --git a/drivers/iio/pressure/st_pressure_core.c b/drivers/iio/pressure/st_pressure_core.c
index ca6863b..bd972ce 100644
--- a/drivers/iio/pressure/st_pressure_core.c
+++ b/drivers/iio/pressure/st_pressure_core.c
@@ -14,7 +14,6 @@
 #include <linux/types.h>
 #include <linux/interrupt.h>
 #include <linux/i2c.h>
-#include <linux/gpio.h>
 #include <linux/irq.h>
 #include <linux/delay.h>
 #include <linux/iio/iio.h>