Switch ath(4) to softcrypto to enable support for WPA/WPA2.
Switch ath(4) to softcrypto to enable support for WPA/WPA2.

Tested by ckuethe@ and many users, thanks!

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars