wilc3000 - efused MAC address not assigned to wlan0 interface

This was "resolved" in an previous release, but the problem is still there:

```
3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
    link/ether fa:f0:05:da:2e:02 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::f8f0:5ff:feda:2e02/64 scope link 
```
