Warning (unit_address_vs_reg): Node /soc/ethernet@4 has a unit name, but no reg property
Warning (unit_address_vs_reg): Node /soc/ethernet@5 has a unit name, but no reg property
Warning (unit_address_vs_reg): Node /soc/ethernet@0 has a unit name, but no reg property
Warning (unit_address_vs_reg): Node /soc/ethernet@1 has a unit name, but no reg property

Fix warning when build with W=1.

Cc: Kejian Yan <yankejian@huawei.com>
Cc: Yisen Zhuang <yisen.zhuang@huawei.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>