virtio-devices: seccomp: Add seccomp filters for virtio_vsock thread

This patch enables the seccomp filters for the virtio_vsock worker
thread.

Partially fixes: #925

Signed-off-by: Bo Chen <chen.bo@intel.com>

vmm/src/device_manager.rs

@@ -2378,6 +2378,7 @@ impl DeviceManager {
                 vsock_cfg.socket.clone(),
                 backend,
                 vsock_cfg.iommu,
+                self.seccomp_action.clone(),
             )
             .map_err(DeviceManagerError::CreateVirtioVsock)?,
         ));