ipq40xx: split orbi devices in router and satellite

ipq40xx: split orbi devices in router and satellite

Netgear Orbi devices are split into router and satellite units. Even
though the hardware is mostly the same, the network configuration is
different. Router units have a designated WAN port while satellite units
have all available ports labeled as "Ethernet".
This splits the device trees into both unit types and adjusts the port
labels.

Signed-off-by: Christoph Krapp <achterin@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/20877
Signed-off-by: Robert Marko <robimarko@gmail.com>