- More reverse engineer: acx111 does support multi-rate retry!

- More reverse engineer: acx111 does support multi-rate retry!
  Collaborated-with: Darron Broad <darron@kewl.org>
- Utilize the new TX rate control algorithm framework in 802.11 layer.
- Support Onoe TX rate control algorithm for acx100.
- Support Onoe TX rate control algorithm and AMRR TX rate control algorithm
  for acx111.  Use AMRR for acx111 by default.
- Use ieee80211_beacon_alloc() in acx_set_{probe_resp,beacon}_tmplt(),
  this corrects IBSS mode support and makes HOSTAP mode support possible.
- Add support for HOSTAP mode.