ramips: DIR-610-A1 Support

http://patchwork.openwrt.org/patch/3933/

Signed-off-by: Flavio Silveira <fggs@terra.com.br>

git-svn-id: svn://svn.openwrt.org/openwrt@37785 3c298f89-4303-0410-b956-a3cf2f4a3e73