net: vrf: Fix operation not supported when set vrf mac

mainline inclusion
from mainline-5.1
commit 6819e3f6
category: bugfix
bugzilla: 14126
CVE: NA

-------------------------------------------------

Vrf device is not able to change mac address now because lack of
ndo_set_mac_address. Complete this in case some apps need to do
this.

Reported-by: Hui Wang <wanghui104@huawei.com>
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Zhiqiang Liu <liuzhiqiang26@huawei.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>