vhost-net-vdpa: add stubs for when no virtio-net device is present

net/vhost-vdpa.c will need functions that are declared in
vhost-shadow-virtqueue.c, that needs functions of virtio-net.c.

Copy the

vhost-net-vdpa: add stubs for when no virtio-net device is present

net/vhost-vdpa.c will need functions that are declared in
vhost-shadow-virtqueue.c, that needs functions of virtio-net.c.

Copy the vhost-vdpa-stub.c code so
only the constructor net_init_vhost_vdpa needs to be defined.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

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