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

Also, other OpenBMC repos are doing the same.

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I449e88bb4e1e262060110e1a8f3e8db3ddfc74cf
diff --git a/oem/ibm/libpldmresponder/file_io.hpp b/oem/ibm/libpldmresponder/file_io.hpp
index 9ff8f86..60fa9a1 100644
--- a/oem/ibm/libpldmresponder/file_io.hpp
+++ b/oem/ibm/libpldmresponder/file_io.hpp
@@ -2,6 +2,10 @@
 
 #include "config.h"
 
+#include "libpldm/base.h"
+#include "oem/ibm/libpldm/file_io.h"
+#include "oem/ibm/libpldm/host.h"
+
 #include "handler.hpp"
 #include "utils.hpp"
 
@@ -15,10 +19,6 @@
 #include <iostream>
 #include <vector>
 
-#include "libpldm/base.h"
-#include "oem/ibm/libpldm/file_io.h"
-#include "oem/ibm/libpldm/host.h"
-
 namespace pldm
 {
 namespace responder