face: move common declarations to face-common.hpp

Change-Id: I0e3e7a93f0693b0e24ca67493a4229987e792ef4
diff --git a/daemon/face/lp-reassembler.hpp b/daemon/face/lp-reassembler.hpp
index e9f0556..95c66ff 100644
--- a/daemon/face/lp-reassembler.hpp
+++ b/daemon/face/lp-reassembler.hpp
@@ -26,16 +26,13 @@
 #ifndef NFD_DAEMON_FACE_LP_REASSEMBLER_HPP
 #define NFD_DAEMON_FACE_LP_REASSEMBLER_HPP
 
-#include "face-log.hpp"
-#include "transport.hpp"
+#include "face-common.hpp"
 
 #include <ndn-cxx/lp/packet.hpp>
 
 namespace nfd {
 namespace face {
 
-class LinkService;
-
 /** \brief reassembles fragmented network-layer packets
  *  \sa https://redmine.named-data.net/projects/nfd/wiki/NDNLPv2
  */