clang-format: update to latest from docs repo

Since `Cpp11` is an alias for `Latest` and we should tend towards using the
latest C++ standard, update the C++ standard to Latest.

https://github.com/llvm/llvm-project/commit/e5032567903de19962333c4bf7d2edceaf4f9824#diff-b49a097415dff2837d9626d422c58ba8R82
https://github.com/openbmc/docs/blob/master/style/cpp/.clang-format

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I6bd62f057c6881b4e931c1968d71ce5478832d73
diff --git a/test/TestBmcEpoch.cpp b/test/TestBmcEpoch.cpp
index 5ed1f3c..651e019 100644
--- a/test/TestBmcEpoch.cpp
+++ b/test/TestBmcEpoch.cpp
@@ -3,9 +3,10 @@
 #include "bmc_epoch.hpp"
 #include "types.hpp"
 
-#include <memory>
 #include <sdbusplus/bus.hpp>
 
+#include <memory>
+
 #include <gtest/gtest.h>
 
 namespace phosphor