The Netgear wgt634u uses minus between the hex digest of the mac
address and all other broadcom devices are using colons between the hex
digest. Now the mac address is correctly parsed also when minus is used.
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@24749 3c298f89-4303-0410-b956-a3cf2f4a3e73
