ppc/xive2: Make type Xive2EndSource not user creatable

Xive2EndSource objects can only be instantiated through a Xive2Router
(PnvXive2).

Reported-by: Thomas Huth <thuth@redhat.com>
Fixes: f8a233d ("ppc/xive2: Introduce a XIVE2 core framework")
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

hw/intc/xive2.c

@@ -1000,6 +1000,7 @@ static void xive2_end_source_class_init(ObjectClass *klass, void *data)
     dc->desc    = "XIVE END Source";
     device_class_set_props(dc, xive2_end_source_properties);
     dc->realize = xive2_end_source_realize;
+    dc->user_creatable = false;
 }
 
 static const TypeInfo xive2_end_source_info = {