MFC r342855:

Use iflib_if_init_locked() during resume instead of iflib_init_locked().

iflib_init_locked() assumes that iflib_stop() has been called, however,
it is not called for suspend. iflib_if_init_locked() calls stop then init,
so fixes the problem.

This was causing errors after a resume from suspend.

PR: 224059
Reported by: zeising
Sponsored by: Limelight Networks