udev: revert workarounds for issues caused by the devlink creation optimization

udev: revert workarounds for issues caused by the devlink creation optimization

This reverts the following two commits:
- "udev: decrease devlink priority for encrypted partitions"
  c4521fc17bb33d10bf5aca3f87f6a394dfecf423.
- "udev: decrease devlink priority for iso disks"
  df1dccd25547b430258bd42ec60428fc9aff1370.

These commits are workarounds for issues caused by
331aa7aa15ee5dd12b369b276f575d521435eb52.
With the previous commit, these workarounds are not necessary anymore,
as partitions are always processed later than their whole disk, and
a decrypted volume is also processed later than its backing volume.