Merge branch 'vdpa-query-set-config' into next

Parav Pandit  says:

====================

This series implements querying and setting of the mac address and mtu
device config fields of the vdpa device of type net.

An example of query and set as below.

$ vdpa dev add name bar mgmtdev vdpasim_net mac 00:11:22:33:44:55 mtu 9000

$ vdpa dev config show
bar: mac 00:11:22:33:44:55 link up link_announce false mtu 9000

$ vdpa dev config show -jp
{
    "config": {
        "bar": {
            "mac": "00:11:22:33:44:55",
            "link ": "up",
            "link_announce ": false,
            "mtu": 1500,
        }
    }
}

====================

Signed-off-by: David Ahern <dsahern@kernel.org>