This is required to use x86/64 in KVM containers with VirtIO disks
Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

Backport of r46017

git-svn-id: svn://svn.openwrt.org/openwrt/branches/chaos_calmer@46018 3c298f89-4303-0410-b956-a3cf2f4a3e73