clang-format: Update to match docs repo

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

Change-Id: I7119c12f1cc0a461cb7e4576dff6a02dcc95cbc4
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/watch.hpp b/watch.hpp
index 0ce5d0e..f7ae6af 100644
--- a/watch.hpp
+++ b/watch.hpp
@@ -3,6 +3,9 @@
 #include <systemd/sd-event.h>
 #include <unistd.h>
 
+#include <functional>
+#include <memory>
+
 namespace openpower
 {
 namespace software