ramips: Add support for the D-Link DCS-930 B1

http://wiki.openwrt.org/toh/d-link/dcs-930l



Signed-off-by: L. D. Pinney <ldpinney@gmail.com>

Backport of r46042

git-svn-id: svn://svn.openwrt.org/openwrt/branches/chaos_calmer@46052 3c298f89-4303-0410-b956-a3cf2f4a3e73