mac80211: add HT support for mesh

This is a quick patch to enable HT for mesh mode
https://github.com/cozybit/open80211s/wiki/HOWTO#high-throughput
http://lists.open80211s.org/pipermail/devel/2012-March/002990.html

For my test setup the speed increased from 1-2 Mbytes/sec to 8-10 Mbytes/sec (iperf)

Signed-off-by: Etienne CHAMPETIER <etienne.champetier@free.fr>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@36639 3c298f89-4303-0410-b956-a3cf2f4a3e73
mac80211: add mesh_param support

This patch add mesh_param support in mac80211.sh
It suppose that this patch http://patchwork.openwrt.org/patch/3540/ is applied (add HT support for mesh)

Tested with rspro(ar9280)/wr1043nd, BB r36211
see also this http://lists.open80211s.org/pipermail/devel/2012-June/003352.html
(mesh_hwmp_rootmode 1 & mesh_gate_announcements 1
=> mesh_hwmp_rootmode 4 & mesh_gate_announcements 1)

Signed-off-by: Etienne CHAMPETIER <etienne.champetier@free.fr>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@36640 3c298f89-4303-0410-b956-a3cf2f4a3e73