[patch] iwi(4) watchdog broken

[Mitsuru IWASAKI]

Hi,

Suspend/Resume problem was solved (thanks bschmidt!),
however problem still remainds after watchdog messages like 
`device timeout' or `firmware stuck in state 4, resetting'.

I've made patches against not only iwi(4) but also net8011 code
and tested for few days;
http://people.freebsd.org/~iwasaki/iwi/iwi-20120403.diff

Please review the patches, Thanks!