adb: QOM'ify Apple Desktop Bus

It was not a qbus before, turn it into a first-class bus and initialize
it properly from CUDA. Leave it a global variable as long as devices are
not QOM'ified yet.

Signed-off-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Alexander Graf <agraf@suse.de>

hw/cuda.c

@@ -712,6 +712,9 @@ static void cuda_initfn(Object *obj)
     for (i = 0; i < ARRAY_SIZE(s->timers); i++) {
         s->timers[i].index = i;
     }
+
+    qbus_create_inplace((BusState *)&adb_bus, TYPE_ADB_BUS, DEVICE(obj),
+                        "adb.0");
 }
 
 static void cuda_class_init(ObjectClass *oc, void *data)