runtime-rs: handle useless Device match arms in dragonball vmm case

Fixes #10361

Signed-off-by: alex.lyn <alex.lyn@antgroup.com>

src/runtime-rs/crates/hypervisor/src/dragonball/inner_device.rs

@@ -98,7 +98,7 @@ impl DragonballInner {
                     .context("add vhost-user-net device")?;
                 Ok(DeviceType::VhostUserNetwork(dev))
             }
-            DeviceType::Vsock(_) | DeviceType::Protection(_) => todo!(),
+            DeviceType::Vsock(_) | DeviceType::Protection(_) | DeviceType::PortDevice(_) => todo!(),
         }
     }