Fix ethernet multicast for ucc_geth.

hw_add_addr_in_hash() already swaps byte
order, don't do it in ucc_geth_set_multi() too.

Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
Acked-by: ucc_geth maintainer
Signed-off-by: Jeff Garzik <jeff@garzik.org>