ralink: add mac address detection for Asus RT-G32 b1

http://patchwork.openwrt.org/patch/4463/



Signed-off-by: Michael Heimpold <mhei@heimpold.de>
Signed-off-by: John Crispin <blogic@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38910 3c298f89-4303-0410-b956-a3cf2f4a3e73