converted iwi(4) for testing Was: [Testers needed!] WiFi drivers changes

[Gleb Smirnoff]

  Michael,

  I've converted iwi(4) and refreshed the D2655. I will appreciate
if you test it. Please report if there are any problems. Thanks!

https://reviews.freebsd.org/D2655

-- 
Totus tuus, Glebius.