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.cpp b/image_manager.cpp
index 226199c..f11d124 100644
--- a/image_manager.cpp
+++ b/image_manager.cpp
@@ -11,15 +11,16 @@
 #include <sys/wait.h>
 #include <unistd.h>
 
-#include <algorithm>
-#include <cstring>
 #include <elog-errors.hpp>
-#include <filesystem>
 #include <phosphor-logging/elog.hpp>
 #include <phosphor-logging/log.hpp>
-#include <string>
 #include <xyz/openbmc_project/Software/Image/error.hpp>
 
+#include <algorithm>
+#include <cstring>
+#include <filesystem>
+#include <string>
+
 namespace phosphor
 {
 namespace software
@@ -40,8 +41,7 @@
     fs::path path;
 
     RemovablePath(const fs::path& path) : path(path)
-    {
-    }
+    {}
     ~RemovablePath()
     {
         if (!path.empty())