Move uuid to //aos:uuid

It is getting usage significantly further outside the logger.  Time to
promote it somewhere better.  I only see it getting used more.

Change-Id: I754739347212f5a3154f68c7b7fc84b9a9074d90
diff --git a/aos/events/simulated_event_loop.h b/aos/events/simulated_event_loop.h
index 3ef7c96..348e7dd 100644
--- a/aos/events/simulated_event_loop.h
+++ b/aos/events/simulated_event_loop.h
@@ -13,11 +13,11 @@
 #include "absl/container/btree_map.h"
 #include "aos/events/event_loop.h"
 #include "aos/events/event_scheduler.h"
-#include "aos/events/logging/uuid.h"
 #include "aos/events/simple_channel.h"
 #include "aos/flatbuffer_merge.h"
 #include "aos/flatbuffers.h"
 #include "aos/ipc_lib/index.h"
+#include "aos/uuid.h"
 #include "glog/logging.h"
 
 namespace aos {