MFC r366800:

MFC r366800:

  net80211: update for (more) VHT160 support

  Implement two macros IEEE80211_VHTCAP_SUPP_CHAN_WIDTH_IS_160MHZ()
  and its 80+80 counter part to check in vhtcaps for appropriate
  levels of support and use the macros throughout the code.

  Add vht160_chan_ranges/is_vht160_valid_freq and handle analogue
  to vht80 in various parts of the code.

  Add ieee80211_add_channel_cbw() which also takes the CBW flag
  fields and make the former ieee80211_add_channel() a wrapper to it.
  With the CBW flags we can add HT/VHT channels passing them to
  getflags() for the 2/5ghz functions.

  In ifconfig(8) add the regdomain_addchans() support for VHT160
  and VHT80P80.

  With this (+ regdoain.xml updates) VHT160 channels can be
  configured, listed, and pass regdomain where appropriate.