Add missing <mutex> header

Also sort the headers in ClatdController.cpp in canonical order.

Test: m netd
Change-Id: I83106ead06294a8bceb952ba89ba2b7b75dcf8b8
diff --git a/server/ClatdController.h b/server/ClatdController.h
index 74eb818..7af6ac3 100644
--- a/server/ClatdController.h
+++ b/server/ClatdController.h
@@ -18,6 +18,7 @@
 #define _CLATD_CONTROLLER_H
 
 #include <map>
+#include <mutex>
 
 namespace android {
 namespace net {