c2k15: stsp@ on wifi and usb matters, and a peek to the UTF-8 future

Stefan Sperling (stsp@) may not have landed just yet, but he did file this report from the newly concluded hackathon:

The net80211 wireless code has plenty of comments referring to sections of and old version of the 802.11 standard. I started updating such references in the ieee80211.h header to the 802.11-2012 ("11n") version of the standard, and also added new macros for meta data added in this newer version.