Support for - service wlx restart

[rs232]

As we have for the MultiWAN:

service wan restart = restarts all the WANs

and

service wan2 restart = restarts wan 2 only

‌

For wireless we only have:

service wireless restart = all the wireless interfaces

where a new syntax like this below would be much appreciated:

service wl0 restart = e.g. to restart only the 2.4GHz interface