cfg80211: add he_capabilities (ext) IE to AP settings

Same as for HT and VHT.
This helps the lower level to know whether the AP supports HE.

CRs-Fixed: 2935250
Signed-off-by: Shaul Triebitz <shaul.triebitz@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
(cherry picked from commit 244eb9ae)
Change-Id: Id0caf8e070f2ac7df82b14ad4c6e10f53053d624
Signed-off-by: Vikram Kandukuri <Vikram.Kandukuri@codeaurora.org>