iio: amplifiers: hmc425a: use pointers in match table

Change the match table to use pointers instead of device ids.
Remove type from state as it is not used anymore.

Also make the chip_info structures const.

Signed-off-by: Dumitru Ceclan <mitrutzceclan@gmail.com>
Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20240220153553.2432-4-mitrutzceclan@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>