IPC/HLE: Associate the ClientSessions with their parent port's HLE interface if it exists.

Pass the triggering ServerSession to the HLE command handler to differentiate which session caused the request.

src/core/hle/service/service.h

@@ -56,7 +56,7 @@ public:
         return "[UNKNOWN SERVICE PORT]";
     }
 
-    ResultCode HandleSyncRequest();
+    ResultCode HandleSyncRequest(Kernel::SharedPtr<Kernel::ServerSession> server_session);
 
 protected:
     /**