ramips: fix Asus WL-330N{, 3G} boards names

There are other Asus boards supported in ramips target, so use the same naming scheme for WL-330N{,3G} boards and their dts files.

Signed-off-by: Piotr Dymacz <pepe2k@gmail.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@46615 3c298f89-4303-0410-b956-a3cf2f4a3e73