dt-bindings: iio/imu: Add Bosch BNO055

Introduce new documentation file for the Bosch BNO055 IMU.

Signed-off-by: Andrea Merello <andrea.merello@iit.it>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20220907132205.28021-12-andrea.merello@iit.it
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>