Fix the compile error for gcc-11

Fix the error: 'sleep_for' is not a member of 'std::this_thread'

Change-Id: If25ef03023df17081878f9b44c3a68195f07c653

rdc_libs/rdc/src/RdcMetricsUpdaterImpl.cc

@@ -22,6 +22,7 @@ THE SOFTWARE.
 #include "rdc_lib/impl/RdcMetricsUpdaterImpl.h"
 #include <sys/time.h>
 #include <ctime>
+#include <thread>
 #include <chrono>  // NOLINT(build/c++11)
 #include "rdc_lib/rdc_common.h"