petalogix_ml605_mmu: Attach ethernet to machine Explicitly make the ethernet a child of the machine. This is needed to set and use links pre-realize. Also makes the ethernet initialization consistent with its peer DMA. Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Reviewed-by: Andreas Färber <afaerber@suse.de> Acked-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>