Documentation: dt: iio: st_lsm6dsx: add disable-sensor-hub property

Enable/disable internal i2c controller slave autoprobing at bootstrap.
Disable sensor-hub is useful if i2c controller clock/data lines are
connected through a pull-up with other chip lines (e.g. SDO/SA0).

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/54287a93922ac839501b776d288cc368aa81f0ab.1636816719.git.lorenzo@kernel.org


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>