iio: adc: ad7192: Organize chip info

Move all chip specific data into chip_info structure.

Signed-off-by: Alisa-Dariana Roman <alisa.roman@analog.com>
Link: https://lore.kernel.org/r/20231010124927.143343-2-alisadariana@gmail.com


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