add station bitrate information
add station bitrate information

cleanups by me (JB)

ewa/iw-modified,cozybit/iw,SoluMachines/external_iw,Distrotech/iw,chunyeow/iw,OSLL/iw,bw-oss/iw,timduru/platform-external-iw,cozybit/iw,TeamEOS/external_iw,TeamEOS/external_iw,CTU-IIG/802.11p-iw,ewa/iw-modified,greearb/iw-ct,chunyeow/iw,bcopeland/android_iw,bw-oss/iw,idor/iw,CTU-IIG/802.11p-iw,OSLL/iw,timduru/platform-external-iw,greearb/iw-ct,Distrotech/iw,SoluMachines/external_iw,idor/iw,bcopeland/android_iw