clang-format: update to latest from docs repo

The openbmc/docs/style/cpp/.clang-format has been updated to support
clang-format10, take this opportunity to update it in this repo.

Change-Id: I9e6b9853bf4cd7399b1ae504ea3be5093d763fee
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
diff --git a/item_updater.cpp b/item_updater.cpp
index 52b60b1..7c9a202 100644
--- a/item_updater.cpp
+++ b/item_updater.cpp
@@ -7,17 +7,18 @@
 #include "version.hpp"
 #include "xyz/openbmc_project/Software/Version/server.hpp"
 
-#include <filesystem>
-#include <fstream>
 #include <phosphor-logging/elog-errors.hpp>
 #include <phosphor-logging/elog.hpp>
 #include <phosphor-logging/log.hpp>
+#include <xyz/openbmc_project/Common/error.hpp>
+#include <xyz/openbmc_project/Software/Image/error.hpp>
+
+#include <filesystem>
+#include <fstream>
 #include <queue>
 #include <set>
 #include <string>
 #include <thread>
-#include <xyz/openbmc_project/Common/error.hpp>
-#include <xyz/openbmc_project/Software/Image/error.hpp>
 
 namespace phosphor
 {