ar71xx: build image for the TL-MR3220 v2

Based on the following patch:
http://patchwork.openwrt.org/patch/3043/



[juhosg: reorder MR3220 MultiProfile entry]

Signed-off-by: Cezary Jackiewicz <cezary.jackiewicz@gmail.com>
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@34782 3c298f89-4303-0410-b956-a3cf2f4a3e73