cfg80211: Add support for HE

Add support for the HE in cfg80211 and also add userspace API to
nl80211 to send rate information out, conforming with P802.11ax_D2.0.

Signed-off-by: Liad Kaufman <[email protected]>
Signed-off-by: Johannes Berg <[email protected]>
Signed-off-by: Ilan Peer <[email protected]>
Signed-off-by: Ido Yariv <[email protected]>
Signed-off-by: Luca Coelho <[email protected]>
Signed-off-by: Johannes Berg <[email protected]>

Author: lucacoelho