MFC: Expand locking coverage to cover if_drv_flags in a few places where it wasn't locked.
MFC: Expand locking coverage to cover if_drv_flags in a few places where
it wasn't locked.

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase