iio: imu: st_lsm6dsx: add support to LSM6DSV

Add support to STM LSM6DSV (accelerometer and gyroscope)
Mems sensor.

Datasheet: https://www.st.com/resource/en/datasheet/lsm6dsv.pdf
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://lore.kernel.org/r/aad879e7af0fe583bbf043a2b93e32fade79fa19.1667216004.git.lorenzo@kernel.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>