sysbus-ohci: Remove user_creatable flag

sysbus-ohci needs to be mapped and wired by device or board code,
and won't work with -device. Remove the user_creatable flag from
the device class.

Cc: Marcel Apfelbaum <marcel@redhat.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Marcel Apfelbaum <marcel@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20170503203604.31462-19-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

hw/usb/hcd-ohci.c

@@ -2159,11 +2159,6 @@ static void ohci_sysbus_class_init(ObjectClass *klass, void *data)
     dc->desc = "OHCI USB Controller";
     dc->props = ohci_sysbus_properties;
     dc->reset = usb_ohci_reset_sysbus;
-    /*
-     * FIXME: Set only because we are not sure yet if this device
-     * will be outside the q35 sysbus whitelist.
-     */
-    dc->user_creatable = true;
 }
 
 static const TypeInfo ohci_sysbus_info = {