iio: imu: adis16480: Add support for ADIS16490

The ADIS16490 is part of the same family with ADIS16495 and ADIS16497,
the main difference is the temperature, accelerometer and gyroscope
scales.

Datasheet:
Link: https://www.analog.com/media/en/technical-documentation/data-sheets/adis16490.pdf



Signed-off-by: Stefan Popa <stefan.popa@analog.com>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>