hw/display/xlnx_dp.c: Add audiodev property

There was no way to set this and we need that for it to be able to properly
initialise.

Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
Message-ID: <16963256573fcbfa7720aa2fd000ba74a4055222.1650874791.git.mkletzan@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

hw/display/xlnx_dp.c

@@ -1385,13 +1385,19 @@ static void xlnx_dp_reset(DeviceState *dev)
     xlnx_dp_update_irq(s);
 }
 
+static Property xlnx_dp_device_properties[] = {
+    DEFINE_AUDIO_PROPERTIES(XlnxDPState, aud_card),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
 static void xlnx_dp_class_init(ObjectClass *oc, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(oc);
 
     dc->realize = xlnx_dp_realize;
     dc->vmsd = &vmstate_dp;
     dc->reset = xlnx_dp_reset;
+    device_class_set_props(dc, xlnx_dp_device_properties);
 }
 
 static const TypeInfo xlnx_dp_info = {