iio: imu: st_lsm6dsx: Fix measurement unit for odr struct member

iio: imu: st_lsm6dsx: Fix measurement unit for odr struct member

[ Upstream commit c6d702f2b77194b62fb2098c63bb7f2a87da142d ]

The `odr` field in struct st_lsm6dsx_sensor contains a data rate
value expressed in mHz, not in Hz.

Fixes: f8710f0357bc3 ("iio: imu: st_lsm6dsx: express odr in mHZ")
Signed-off-by: Francesco Lavra <flavra@baylibre.com>
Acked-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>