clang-format: Update to match docs repo

Update the .clang-format file.
Now includes header sorting and updating PointerAlignment.

Change-Id: I5c7690d8d83cdebe26ff3a73b90a2a8c17dd8054
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/serialize.cpp b/serialize.cpp
index f52ec16..2acc373 100644
--- a/serialize.cpp
+++ b/serialize.cpp
@@ -1,8 +1,10 @@
 #include "config.h"
-#include <experimental/filesystem>
-#include <cereal/archives/json.hpp>
-#include <fstream>
+
 #include "serialize.hpp"
+
+#include <cereal/archives/json.hpp>
+#include <experimental/filesystem>
+#include <fstream>
 #include <sdbusplus/server.hpp>
 
 namespace phosphor