Merge "Add explicit <mutex> include" into main am: 716c482

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/3459703

Change-Id: I47e942df0d3fa1eec02f73d78ca8f81750d259af
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

Author: Treehugger Robot

libs/binder/include/binder/RpcThreads.h

@@ -20,6 +20,7 @@
 #include <condition_variable>
 #include <functional>
 #include <memory>
+#include <mutex>
 #include <thread>
 
 #include <binder/Common.h>