rtwn: export more stats to net80211

Setup more ieee80211_rx_stats fields for received frames:

• pktflags:
  • IEEE80211_RX_F_FAIL_FCSCRC;
  • IEEE80211_RX_F_AMPDU;
  • IEEE80211_RX_F_AMPDU_MORE;
  • IEEE80211_RX_F_SHORTGI;
• rate flags (CCK, OFDM, HT);
• width;
• phytype;
• rate;
• rx_tsf;
• rssi;
• nf;
• ieee, freq (RTL8188EU only, when ht40 support is disabled).

Tested with:

• RTL8188CE, RTL8188EU, RTL8821AU (STA / AP modes, i386)
• (by kevlo) RTL8188EU and RTL8812AU (amd64)

Reviewed by: adrian (previous version), kevlo
Differential Revision: https://reviews.freebsd.org/D9021