staging:iio:ad5933: drop assign iio_info.driver_module

The equivalent of this is now done via macro magic when
the relevant register call is made. The actual structure
elements will shortly go away.

Signed-off-by: Jonathan Cameron <[e-mail]>
Reviewed-by: Lars-Peter Clausen <[e-mail]>

drivers/staging/iio/impedance-analyzer/ad5933.c

···
 static const struct iio_info ad5933_info = {
 	.read_raw = ad5933_read_raw,
 	.attrs = &ad5933_attribute_group,
-	.driver_module = THIS_MODULE,
 };
 
 static int ad5933_ring_preenable(struct iio_dev *indio_dev)