Add nvram option for undefine vm

With crc-org/machine-driver-libvirt@a130898
now `nvram` is added to domain template and as part of undefine it we
need to use this flag otherwise following error occur during `crc
cleanup` if domain is present.

```
Code=55, Domain=10, Message='Requested operation is not valid: cannot undefine domain with nvram'
```

This pr even work with current template where no `<nvram />` present.

pkg/crc/preflight/preflight_checks_linux.go

@@ -604,7 +604,7 @@ func removeCrcVM() error {
 			return fmt.Errorf("Failed to destroy 'crc' VM")
 		}
 	}
-	_, stderr, err := crcos.RunWithDefaultLocale("virsh", "--connect", "qemu:///system", "undefine", constants.DefaultName)
+	_, stderr, err := crcos.RunWithDefaultLocale("virsh", "--connect", "qemu:///system", "undefine", "--nvram", constants.DefaultName)
 	if err != nil {
 		logging.Debugf("%v : %s", err, stderr)
 		return fmt.Errorf("Failed to undefine 'crc' VM")