dt-bindings: iio: accel: Add bmi085 and bmi090l bindings

dt-bindings: iio: accel: Add bmi085 and bmi090l bindings

Adds the device-tree bindings for the Bosch
BMI085 and BMI090L IMU, the accelerometer part.

Datasheet: https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmi085-ds001.pdf
Datasheet: https://media.digikey.com/pdf/Data%20Sheets/Bosch/BST-BMI090L-DS000-00.pdf
Signed-off-by: LI Qingwu <Qing-wu.Li@leica-geosystems.com.cn>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220526133359.2261928-7-Qing-wu.Li@leica-geosystems.com.cn
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>