dbusconfiguration: fixup header inclusion

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: Ic42e7eb67d18e330c4b74f751d5db338845cb1e4
diff --git a/dbus/dbusconfiguration.cpp b/dbus/dbusconfiguration.cpp
index c3c72bd..7402de0 100644
--- a/dbus/dbusconfiguration.cpp
+++ b/dbus/dbusconfiguration.cpp
@@ -15,6 +15,8 @@
 */
 
 #include "conf.hpp"
+#include "dbushelper.hpp"
+#include "dbusutil.hpp"
 #include "util.hpp"
 
 #include <boost/asio/steady_timer.hpp>