[ath] AR9285 / AR2427 testers needed!

[Bartosz Fabianowski]

I just tested the newest code on a box running -stable from 22nd January 
2011. My NIC is AR2427. The driver attaches to it just fine, 
wpa_supplicant and dhclient work. But the card is extremely instable, 
losing signal after 30 seconds at the latest. The following message is 
printed on the terminal:

ath0: bb hang detected (0x80), resetting

Sometimes, this reset seems successful and network connectivity comes 
back. In most cases though, I need to power-cycle the NIC and re-run 
wpa_supplicant and dhclient.

Since I had not discovered yet that ath can be built as a separate 
module, I transplanted dev/ath and modules/ath into the main source 
tree. I also had to adjust sys/conf/files and 
sys/net80211/ieee80211_var.h, adding two missing fields in the latter.

- Bartosz