3.18.13 introduced a bunch of new errata, enable them to be on the
safe side.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@45715 3c298f89-4303-0410-b956-a3cf2f4a3e73