Load pefs module at boot time
Summary:
The devserver role on FreeBSD includes PEFS. The module should be
loaded at boot time to facilitate operations.
Fixes T2118.
Test Plan: Tested on WindRiver
Reviewers: dereckson
Reviewed By: dereckson
Maniphest Tasks: T2118
Differential Revision: https://devcentral.nasqueron.org/D3639