sensors/builder: add missing headers

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: Ie6c26c27d292ad82a5113dce03439e40cae14904
diff --git a/sensors/builder.hpp b/sensors/builder.hpp
index 236fee7..bea3bd0 100644
--- a/sensors/builder.hpp
+++ b/sensors/builder.hpp
@@ -1,8 +1,11 @@
 #pragma once
 
+#include "conf.hpp"
 #include "sensors/manager.hpp"
 #include "sensors/sensor.hpp"
 
+#include <sdbusplus/bus.hpp>
+
 #include <map>
 #include <string>