dataplane: fix build breakage on set_guest_notifiers()

virtio_pci_set_guest_notifiers() now takes an additional argument to
specify the number of virtqueues to assign a guest notifier for. This
causes a build breakage for CONFIG_VIRTIO_BLK_DATA_PLANE builds:

/home/mdroth/w/qemu2.git/hw/dataplane/virtio-blk.c: In function
‘virtio_blk_data_plane_start’:
/home/mdroth/w/qemu2.git/hw/dataplane/virtio-blk.c:451:47: error: too
few arguments to function ‘s->vdev->binding->set_guest_notifiers’
/home/mdroth/w/qemu2.git/hw/dataplane/virtio-blk.c: In function
‘virtio_blk_data_plane_stop’:
/home/mdroth/w/qemu2.git/hw/dataplane/virtio-blk.c:511:5: error: too few
arguments to function ‘s->vdev->binding->set_guest_notifiers’
make[1]: *** [hw/dataplane/virtio-blk.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make: *** [subdir-x86_64-softmmu] Error 2

Fix this by passing 1 as the number of virtqueues to assign notifiers
for.
Signed-off-by: NMichael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

hw/dataplane/virtio-blk.c

@@ -447,7 +447,7 @@ void virtio_blk_data_plane_start(VirtIOBlockDataPlane *s)
     event_poll_init(&s->event_poll);
 
     /* Set up guest notifier (irq) */
-    if (s->vdev->binding->set_guest_notifiers(s->vdev->binding_opaque,
+    if (s->vdev->binding->set_guest_notifiers(s->vdev->binding_opaque, 1,
                                               true) != 0) {
         fprintf(stderr, "virtio-blk failed to set guest notifier, "
                 "ensure -enable-kvm is set\n");
@@ -508,7 +508,7 @@ void virtio_blk_data_plane_stop(VirtIOBlockDataPlane *s)
     event_poll_cleanup(&s->event_poll);
 
     /* Clean up guest notifier (irq) */
-    s->vdev->binding->set_guest_notifiers(s->vdev->binding_opaque, false);
+    s->vdev->binding->set_guest_notifiers(s->vdev->binding_opaque, 1, false);
 
     vring_teardown(&s->vring);
 }