some wmm parameter improvements
some wmm parameter improvements

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