ramips: Add Support for the Linksys RE6500

This patch adds support for the Linksys RE6500 Range Extender

http://wiki.openwrt.org/toh/linksys/re6500



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

Backport of r46043

git-svn-id: svn://svn.openwrt.org/openwrt/branches/chaos_calmer@46053 3c298f89-4303-0410-b956-a3cf2f4a3e73