mac80211: backport devm_kmemdup

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43277 3c298f89-4303-0410-b956-a3cf2f4a3e73
mac80211: backport list_last_entry

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43278 3c298f89-4303-0410-b956-a3cf2f4a3e73
mac80211: fix VHT rate selection

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43279 3c298f89-4303-0410-b956-a3cf2f4a3e73
trace-cmd: update to v2.4

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43280 3c298f89-4303-0410-b956-a3cf2f4a3e73
ramips: fix default config breakage on whr-1166d

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43281 3c298f89-4303-0410-b956-a3cf2f4a3e73