mediatek: filogic: prevent faulty mac address assignment

mediatek: filogic: prevent faulty mac address assignment

The vendor U-Boot on the Cudy M3000 and the Yuncore AX835 assign random
mac addresses on boot and set the 'local-mac-address' property which
prevents Openwrt from assigning the correct address from evmem.

This patch removes the alias for ethernet0 so that U-Boot doesn't add the
property, removes the workaround from 02_network, and adds back the nvmem
definition for the M3000.

Signed-off-by: Leon M. Busch-George <leon@georgemail.eu>
(cherry picked from commit a55ab9e1343e85021253e9c55f67adf33ad68f09)