This uses the flash locations instead of eth0 MAC address to
calculate MAC address increments for WAN.
The change will make the MAC address setup of a particular device
more obvious and removes the dependency of 02_network on the eth0
initialization.
While at it, change the partition label for zyxel,keenetic-extra-ii
to factory to be consistent with node label and all the other devices.
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
fef1810897