Device drivers may be installed and started on prefix initialization but
if PlugPlay is missing they won't be able to send plugplay notifications
until the prefix is restarted.

The service has StartType=2, and should start automatically.
Signed-off-by: Rémi Bernon <rbernon@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>