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Add the function to support setting the MAC address.
For vdpa/mlx5, the function will use mlx5_mpfs_add_mac
to set the mac address

Tested in ConnectX-6 Dx device
Signed-off-by: Cindy Lu <lulu@redhat.com>
Message-Id: <20240731031653.1047692-4-lulu@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>