iio: adc: ad7192: Revert "properly check spi_get_device_match_data()"

iio: adc: ad7192: Revert "properly check spi_get_device_match_data()"

This reverts commit b7f99fa1b64af2f696b13cec581cb4cd7d3982b8.

The added code is currently a dead code. Moreover, the driver is not
designed to have any defaults effectively making driver data a mandatory
information to work with. Taking all together, revert unneeded change.

Discussion at #1 concluded in agreeing a new policy on this for IIO.

Link: https://lore.kernel.org/linux-iio/20260217080514.1288115-1-andriy.shevchenko@linux.intel.com/
Reported-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>