[ar71xx]: generate images for the On Networks N150 (rebranded Netgear WNR612v2)

Signed-off-by: Imre Kaloz <kaloz@openwrt.org>



git-svn-id: svn://svn.openwrt.org/openwrt/trunk@39320 3c298f89-4303-0410-b956-a3cf2f4a3e73