mac80211: backport required changes to support 3.9-rc kernels

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@36007 3c298f89-4303-0410-b956-a3cf2f4a3e73
kernel: add support for 3.9-rc2

Signed-off-by: Florian Fainelli <florian@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@36008 3c298f89-4303-0410-b956-a3cf2f4a3e73