iio: imu: adis16400: Use separate structures rather than an array for chip info

Change the adis16400 driver to use individual chip info structures
instead of an array. This reduces the verbosity of the code. Also, the
data is now const as it should have been in the first place.

Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20250628-iio-const-data-17-v1-1-a215ebb653ec@baylibre.com


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