ar71xx: switch to linux 3.14

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43343 3c298f89-4303-0410-b956-a3cf2f4a3e73
ar71xx: remove linux 3.10 support

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43344 3c298f89-4303-0410-b956-a3cf2f4a3e73