virtio-serial-ccw: switch to the new API.

virtio-serial-ccw: switch to the new API.

Here the virtio-serial-ccw is modified for the new API. The device
virtio-serial-ccw extends virtio-ccw-device as before. It creates and
connects a virtio-serial during the init. The properties are not modified.

Signed-off-by: KONRAD Frederic <[email protected]>
Reviewed-by: Cornelia Huck <[email protected]>
Reviewed-by: Peter Maydell <[email protected]>
Tested-by: Cornelia Huck <[email protected]>
Acked-by: Amit Shah <[email protected]>
Message-id: 1365512016[email protected]
Signed-off-by: Anthony Liguori <[email protected]>