Only assign a pvid if the current pvid is 0. Fixes using mixed tagged
and untagged traffic on a port and the untagged vlan isn't the last one
of which the port is a member.
Tested on RTL8366S and RTL8367R.
Fixes#8501.
Signed-off-by: Jonas Gorski <jogo@openwrt.org>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@35227 3c298f89-4303-0410-b956-a3cf2f4a3e73