iio: adc: ad_sigma_delta: add tab to align irq_line

Align the irq_line field in struct ad_sigma_delta with the other fields.

Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20241122-iio-adc-ad_signal_delta-fix-align-v1-1-d0a071d2dc83@baylibre.com


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