85xx: Always attempt ethernet device tree fixup

Its reasonable that we may have ethernet devices but dont have drivers
or support enabled for them in u-boot and want the device tree fixed up.
Unconditionally calling the ethernet fixup is fine since if we dont have
ethernet nodes that match (or aliases) we will not attempt to do
anything.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Timur Tabi <timur@freescale.com>