wifi: Introduce 802.11ac support

This patch introduces 802.11ac support to mac80211 and hostapd. The split of
VHT160 in two 80 MHz bands is not yet supported, since it requires an
additional user supplied parameter for the channel of the second band.

Signed-off-by: Matti Laakso <malaakso@elisanet.fi>
Signed-off-by: Simon Wunderlich <simon@open-mesh.com>
[sven@open-mesh.com: Rebased patch, merged htmode and vhtmode,
removed special hwmode, replaced uci vht_capab list with overwritable
autoconfig, fixed hostapd integration, fixed commit description, add HT40+/-
for VHT modes, add VHT40 center_freq autoconfig, refactored major parts]
Signed-off-by: Sven Eckelmann <sven@open-mesh.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@39456 3c298f89-4303-0410-b956-a3cf2f4a3e73
ath10k: add all patches from trunk, change to 10.x firmware

The current version of the driver includes a lot of bug fixes necessary to get
802.11ac connections working at all. These patches also need a never firmware
to work correctly.

Signed-off-by: Simon Wunderlich <simon@open-mesh.com>
[sven@open-mesh.com: Refreshed patches]
Signed-off-by: Sven Eckelmann <sven@open-mesh.com>