face: move common declarations to face-common.hpp

Change-Id: I0e3e7a93f0693b0e24ca67493a4229987e792ef4
diff --git a/daemon/face/unix-stream-channel.cpp b/daemon/face/unix-stream-channel.cpp
index 4ef1a18..b60ba78 100644
--- a/daemon/face/unix-stream-channel.cpp
+++ b/daemon/face/unix-stream-channel.cpp
@@ -24,6 +24,7 @@
  */
 
 #include "unix-stream-channel.hpp"
+#include "face.hpp"
 #include "generic-link-service.hpp"
 #include "unix-stream-transport.hpp"
 #include "common/global.hpp"