Previously, all VLANs (port-based or 802.1q) were sharing

Previously, all VLANs (port-based or 802.1q) were sharing
a single database in the ATU. This created problems in the
case of a system where two ports/devices share a MAC address
(e.g. Linksys WRT1900AC eth0/eth1).

This also clears any bootloader-set FDB defaults. This had
caused issues creating port-based VLANs when mappings
overlapped previous VLANs. Packets destined to a port
not in the default port group flooded all ports.

Tested on a 88E6171 (Linksys EA4500) and 88E6172 ('1900AC)

Signed-off-by: Claudio Leite <leitec@staticky.com>
Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@46699 3c298f89-4303-0410-b956-a3cf2f4a3e73