iio: adc: ad7606: Fix typo in the driver name

The parallel driver's name is ad7606_par and not ad7606_parallel.

Fixes: 0046a46a ("staging/ad7606: Actually build the interface modules")
Signed-off-by: Guillaume Stols <gstols@baylibre.com>
Link: https://patch.msgid.link/20241004-ad7606_add_iio_backend_support-v3-1-38757012ce82@baylibre.com


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