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/image_manager_main.cpp b/image_manager_main.cpp
index 867a960..7b4e18e 100644
--- a/image_manager_main.cpp
+++ b/image_manager_main.cpp
@@ -3,11 +3,12 @@
 #include "image_manager.hpp"
 #include "watch.hpp"
 
-#include <cstdlib>
-#include <exception>
 #include <phosphor-logging/log.hpp>
 #include <sdbusplus/bus.hpp>
 
+#include <cstdlib>
+#include <exception>
+
 int main()
 {
     using namespace phosphor::software::manager;