Support ADI specific prb23 sequence that can be used both for calibrating or debugging digital interfaces. Signed-off-by: Nuno Sa <nuno.sa@analog.com> Link: https://patch.msgid.link/20240802-dev-iio-backend-add-debugfs-v2-3-4cb62852f0d0@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>