dt-bindings: iio: imu: bmi270: Add Bosch BMI260

The BMI260's register map, configuration, and capabilities are nearly
identical to the BMI270, but the devices have different chip IDs and
require different initialization firmware.

Signed-off-by: Justin Weiss <justin@justinweiss.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://patch.msgid.link/20241027172029.160134-4-justin@justinweiss.com


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