Replace rtw_ieee80211_channel_flags with ieee80211_channel_flags from net/cfg80211.h
Replace rtw_ieee80211_root_mode_identifier with ieee80211_root_mode_identifier from linux/ieee80211.h
port b658acbf64ae38b8fca982c2929ccc0bf4eb1ea2
port 5befa937e8daaebcde81b9423eb93f3ff2e918f7
The values defined in enum WIFI_FRAME_SUBTYPE are the same the #define
IEEE80211_STYPE_xxx from <linux/ieee80211.h>.
Port 33ed2b7079f6c38abce6abbaf1e6be4edad919d8