net: ethernet: Remove superfluous ether_setup after alloc_etherdev

There is no need to call ether_setup after alloc_ethdev since it was
already called there.

Follow commits c706471b ("net: axienet: remove unnecessary
ether_setup after alloc_etherdev") and 3c87dcbf ("net: ll_temac:
Remove unnecessary ether_setup after alloc_etherdev") and fix the
pattern in all remaining ethernet drivers.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>