iio: adi: ad7192: Add error check and more debug log

Print read and expected device ID as debug warning.
Add error check for ad_sd_init() result.

Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Signed-off-by: Markus Burri <markus.burri@mt.com>
Link: https://lore.kernel.org/r/20230614073033.2497318-1-markus.burri@mt.com


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