iio: magnetometer: als31300: remove unused IIO_CHAN_INFO_PROCESSED handling
The als31300 driver does not advertise IIO_CHAN_INFO_PROCESSED in its
info_mask_* fields, so the corresponding case in read_raw() is never used.
Drop the dead code to reduce unnecessary branches and improve clarity.
Signed-off-by: Dixit Parmar <dixitparmar19@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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