Remove easy uses of //aos/mutex

I was hoping to get rid of it completely as one of the nontrivial users
of AOS_LOG, but need to write a compatible condition variable first.

Change-Id: I86c1c4084882bf789baabd0255e115d821154830
diff --git a/aos/starter/starter.cc b/aos/starter/starter.cc
index fa0daae..c30a373 100644
--- a/aos/starter/starter.cc
+++ b/aos/starter/starter.cc
@@ -27,6 +27,8 @@
 #include <memory>
 #include <set>
 
+#include "absl/base/call_once.h"
+#include "glog/logging.h"
 #include "third_party/libevent/event.h"
 
 #include "aos/libc/aos_strsignal.h"
@@ -36,7 +38,6 @@
 #include "aos/unique_malloc_ptr.h"
 #include "aos/util/run_command.h"
 #include "aos/init.h"
-#include "absl/base/call_once.h"
 
 // This is the main piece of code that starts all of the rest of the code and
 // restarts it when the binaries are modified.