vdpa_sim_net: Offer VIRTIO_NET_F_STATUS

VIRTIO_NET_S_LINK_UP is already returned in config reads since vdpasim
creation, but the feature bit was not offered to the driver.

Tested modifying VIRTIO_NET_S_LINK_UP and different values of "status"
in qemu virtio-net options, using vhost_vdpa.

Not considering as a fix, because there should be no driver trusting in
this config read before the feature flag.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Message-Id: <20221117155502.1394700-1-eperezma@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Tested-by: Lei Yang <leiyang@redhat.com>

drivers/vdpa/vdpa_sim/vdpa_sim_net.c

@@ -27,6 +27,7 @@
 
 #define VDPASIM_NET_FEATURES	(VDPASIM_FEATURES | \
 				 (1ULL << VIRTIO_NET_F_MAC) | \
+				 (1ULL << VIRTIO_NET_F_STATUS) | \
 				 (1ULL << VIRTIO_NET_F_MTU) | \
 				 (1ULL << VIRTIO_NET_F_CTRL_VQ) | \
 				 (1ULL << VIRTIO_NET_F_CTRL_MAC_ADDR))