ramips: fix port display for D-Link DIR-810L

ramips: fix port display for D-Link DIR-810L

The port order displayed in LuCI is currently inverted for this
devices:

LuCI - Device
LAN1 - LAN4
LAN2 - LAN3
LAN3 - LAN2
LAN4 - LAN1

Fix it.

Strangely, the owner of a TRENDnet TEW-810DR reports that the
initial port order is correct, while both devices share the
same board and look similar from the outside. Since I cannot
investigate this without having any of the devices, this does
only touch the DIR-810L for now.

While at it, also merge in the case for zbtlink,zbt-we2026, as
the display port specified for WAN there won't have any effect
anyway.

Reported-by: Roger Pueyo Centelles <roger.pueyo@guifi.net>
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>