urtwn: add support for hardware encryption (WEP, TKIP and CCMP)
Tested with:
- RTL8188EU;
- RTL8188CUS;
Modes:
- IBSS mode: TKIP, CCMP (WPA-None);
- STA / HOSTAP modes - WEP (static), TKIP, CCMP;
Reviewed by: kevlo
Approved by: adrian (mentor)
Obtained from: OpenBSD (mostly)
Differential Revision: https://reviews.freebsd.org/D4448