hw/xen: Remove empty Property lists

There is no point in registering no properties.
Remove xen_sysdev_class_init entirely, as it did nothing else.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Lei Yang <leiyang@redhat.com>
Link: https://lore.kernel.org/r/20241218134251.4724-10-richard.henderson@linaro.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

hw/xen/xen-legacy-backend.c

@@ -635,15 +635,10 @@ int xen_be_bind_evtchn(struct XenLegacyDevice *xendev)
 }
 
 
-static Property xendev_properties[] = {
-    DEFINE_PROP_END_OF_LIST(),
-};
-
 static void xendev_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
 
-    device_class_set_props(dc, xendev_properties);
     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
     /* xen-backend devices can be plugged/unplugged dynamically */
     dc->user_creatable = true;
@@ -674,22 +669,10 @@ static const TypeInfo xensysbus_info = {
     }
 };
 
-static Property xen_sysdev_properties[] = {
-    {/* end of property list */},
-};
-
-static void xen_sysdev_class_init(ObjectClass *klass, void *data)
-{
-    DeviceClass *dc = DEVICE_CLASS(klass);
-
-    device_class_set_props(dc, xen_sysdev_properties);
-}
-
 static const TypeInfo xensysdev_info = {
     .name          = TYPE_XENSYSDEV,
     .parent        = TYPE_SYS_BUS_DEVICE,
     .instance_size = sizeof(SysBusDevice),
-    .class_init    = xen_sysdev_class_init,
 };
 
 static void xenbe_register_types(void)