iio: imu: st_lsmdsx: compact st_lsm6dsx_sensor_settings table

Shrink st_lsm6dsx_sensor_settings table size moving wai address info in
id array and remove duplicated code
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://lore.kernel.org/r/c43286938b2fe03ab3abdb5fc095ea6b950abcb1.1606557946.git.lorenzo@kernel.orgSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h

@@ -266,7 +266,6 @@ struct st_lsm6dsx_ext_dev_settings {
 
 /**
  * struct st_lsm6dsx_settings - ST IMU sensor settings
- * @wai: Sensor WhoAmI default value.
  * @reset: register address for reset.
  * @boot: register address for boot.
  * @bdu: register address for Block Data Update.
@@ -284,7 +283,6 @@ struct st_lsm6dsx_ext_dev_settings {
  * @shub_settings: i2c controller related settings.
  */
 struct st_lsm6dsx_settings {
-	u8 wai;
 	struct st_lsm6dsx_reg reset;
 	struct st_lsm6dsx_reg boot;
 	struct st_lsm6dsx_reg bdu;
@@ -292,6 +290,7 @@ struct st_lsm6dsx_settings {
 	struct {
 		enum st_lsm6dsx_hw_id hw_id;
 		const char *name;
+		u8 wai;
 	} id[ST_LSM6DSX_MAX_ID];
 	struct {
 		const struct iio_chan_spec *chan;