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/logging/log_reader.h b/aos/events/logging/log_reader.h
index 24ac5c9..37163c1 100644
--- a/aos/events/logging/log_reader.h
+++ b/aos/events/logging/log_reader.h
@@ -11,13 +11,13 @@
 #include "aos/events/logging/logfile_sorting.h"
 #include "aos/events/logging/logfile_utils.h"
 #include "aos/events/logging/logger_generated.h"
-#include "aos/events/logging/uuid.h"
 #include "aos/events/simulated_event_loop.h"
 #include "aos/network/message_bridge_server_generated.h"
 #include "aos/network/multinode_timestamp_filter.h"
 #include "aos/network/remote_message_generated.h"
 #include "aos/network/timestamp_filter.h"
 #include "aos/time/time.h"
+#include "aos/uuid.h"
 #include "flatbuffers/flatbuffers.h"
 
 namespace aos {