sysutils/nut: Guarantee that devfs is started

devfs does not always win the race with nut causing nut to fail to
start in some installations.

PR: 258190
Submitted by: hsakamt@tsnr.com
Reported by: hsakamt@tsnr.com

(cherry picked from commit 89602a6df642dbbfb42447355f8fb8a10641bcad)