reorder headers

Reordering all the headers to the following structure:

header file:
local
c
cpp (including openbmc libraries)

source file:
source.hpp (if applicable)
local
c
cpp

Change-Id: Ia74a5c761a3029819366159de3cfd40c5e4c4a2c
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/watch.hpp b/watch.hpp
index 0e20420..6a274aa 100644
--- a/watch.hpp
+++ b/watch.hpp
@@ -1,15 +1,15 @@
 #pragma once
 
+#include "dns_updater.hpp"
 #include "util.hpp"
 #include "types.hpp"
-#include "dns_updater.hpp"
-
-#include <systemd/sd-event.h>
 
 #include <sys/inotify.h>
-#include <map>
-#include <functional>
+#include <systemd/sd-event.h>
+
 #include <experimental/filesystem>
+#include <functional>
+#include <map>
 
 namespace phosphor
 {