iio: move 3-wire spi initialization to st_sensors_spi

Some devices need to be configured with special bit in order to
use spi 3-wire. This was done during device identification phase.
Instead, let's move this part as spi specific.
Doing this the check_device_support function becomes a simple
device id check, so let's rename it.

Signed-off-by: Denis Ciocca <denis.ciocca@st.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/gyro/st_gyro_core.c

@@ -400,9 +400,7 @@ int st_gyro_common_probe(struct iio_dev *indio_dev)
 	if (err)
 		return err;
 
-	err = st_sensors_check_device_support(indio_dev,
-					ARRAY_SIZE(st_gyro_sensors_settings),
-					st_gyro_sensors_settings);
+	err = st_sensors_verify_id(indio_dev);
 	if (err < 0)
 		goto st_gyro_power_off;
 

drivers/iio/gyro/st_gyro_spi.c

@@ -91,7 +91,9 @@ static int st_gyro_spi_probe(struct spi_device *spi)
 	gdata = iio_priv(indio_dev);
 	gdata->sensor_settings = (struct st_sensor_settings *)settings;
 
-	st_sensors_spi_configure(indio_dev, spi, gdata);
+	err = st_sensors_spi_configure(indio_dev, spi);
+	if (err < 0)
+		return err;
 
 	err = st_gyro_common_probe(indio_dev);
 	if (err < 0)