base-files: introduce 802.11ac support

Signed-off-by: Matti Laakso <malaakso@elisanet.fi>
Signed-off-by: Dirk Neukirchen <dirkneukirchen@web.de>
kernel/mac80211: introduce 802.11ac support

Signed-off-by: Matti Laakso <malaakso@elisanet.fi>
Signed-off-by: Dirk Neukirchen <dirkneukirchen@web.de>
hostapd: modify 802.11ac support

Signed-off-by: Dirk Neukirchen <dirkneukirchen@web.de>