This wifi module doesn't ship with the L5, but I have one because it's
generally more stable than the redpine thing that does ship with the
L5... however there's a known problem with having PM enabled on it.
This adds a NM config option, that matches specifically on this
device/driver, to disable wifi. PM for the redpine should not be
affected by this config change.
[ci:skip-build] already built successfully in CI
