mac80211: merge a patch that enables DFS for ad-hoc mode

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38801 3c298f89-4303-0410-b956-a3cf2f4a3e73
ath9k: add a fix to improve reliability of high bitrates on AR93xx/AR95xx

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38802 3c298f89-4303-0410-b956-a3cf2f4a3e73