ARM: mvebu: Add ethernet aliases required by U-Boot

The vendor bootloader provided for Armada 375 boards expect an
alias for the ethernet nodes, which is used to fixup the MAC address.

Signed-off-by: Marcin Wojtas <mw@semihalf.com>
Link: https://lkml.kernel.org/r/1405961296-5846-6-git-send-email-ezequiel.garcia@free-electrons.com


Signed-off-by: Jason Cooper <jason@lakedaemon.net>