mac80211: update to 2013-01-07, add several ath9k stability fixes

git-svn-id: svn://svn.openwrt.org/openwrt@35063 3c298f89-4303-0410-b956-a3cf2f4a3e73
ath9k: backport stability fixes from r35063

git-svn-id: svn://svn.openwrt.org/openwrt@35064 3c298f89-4303-0410-b956-a3cf2f4a3e73
mac80211: refresh patches

git-svn-id: svn://svn.openwrt.org/openwrt@35065 3c298f89-4303-0410-b956-a3cf2f4a3e73
mac80211, ath9k: merge some pending fixes from linux-wireless@

git-svn-id: svn://svn.openwrt.org/openwrt@35066 3c298f89-4303-0410-b956-a3cf2f4a3e73