lantiq: etop enable gbit port0

Signed-off-by: Antonios Vamporakis <vamporakis@yahoo.com>
Signed-off-by: Luka Perkov <luka@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@37191 3c298f89-4303-0410-b956-a3cf2f4a3e73