bsdbox: hook wpa_supplicant up as well

We may want a knob for this later for Adrian's wifi-box builds if those
are still happening now that mips is gone, but I suspect it's less of a
concern for FreeBSD > 14 (and maybe even 14 as well).

Reviewed by: adrian, imp
Differential Revision: https://reviews.freebsd.org/D42501