pci, virtio-devices: Move VirtioPciDevice to the new restore design

The code for restoring a VirtioPciDevice has been updated, including the
dependencies VirtioPciCommonConfig, MsixConfig and PciConfiguration.

It's important to note that both PciConfiguration and MsixConfig still
have restore() implementations because Vfio and VfioUser devices still
rely on the old way for restore.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

vmm/src/device_manager.rs

@@ -3515,6 +3515,7 @@ impl DeviceManager {
                 pci_segment_id > 0 || device_type != VirtioDeviceType::Block as u32,
                 dma_handler,
                 self.pending_activations.clone(),
+                vm_migration::snapshot_from_id(self.snapshot.as_ref(), id.as_str()),
             )
             .map_err(DeviceManagerError::VirtioDevice)?,
         ));