hisi_acc_vfio_pci: Enable PRE_COPY flag

Now that we have everything to support the PRE_COPY state,
enable it.
Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Link: https://lore.kernel.org/r/20221123113236.896-5-shameerali.kolothum.thodi@huawei.comSigned-off-by: Alex Williamson <alex.williamson@redhat.com>

drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c

@@ -1351,7 +1351,7 @@ static int hisi_acc_vfio_pci_migrn_init_dev(struct vfio_device *core_vdev)
 	hisi_acc_vdev->vf_dev = pdev;
 	mutex_init(&hisi_acc_vdev->state_mutex);
 
-	core_vdev->migration_flags = VFIO_MIGRATION_STOP_COPY;
+	core_vdev->migration_flags = VFIO_MIGRATION_STOP_COPY | VFIO_MIGRATION_PRE_COPY;
 	core_vdev->mig_ops = &hisi_acc_vfio_pci_migrn_state_ops;
 
 	return vfio_pci_core_init_dev(core_vdev);