It fails to start radiusd.service from lib32-freeradius that the
configure directory is /etc/lib32-raddb rather than /etc/raddb. So add
an environment file to export a variable MLPREFIX for the service file
to make it start successfully.
Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>