Add missing boss:U service, needed according to Nintendo Zone logs.

src/core/hle/service/boss_u.cpp

@@ -0,0 +1,28 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#include "common/log.h"
+#include "core/hle/hle.h"
+#include "core/hle/service/boss_u.h"
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// Namespace BOSS_U
+
+namespace BOSS_U {
+
+    const Interface::FunctionInfo FunctionTable[] = {
+        {0x00020100, nullptr,               "GetStorageInfo"},
+    };
+
+    ////////////////////////////////////////////////////////////////////////////////////////////////////
+    // Interface class
+
+    Interface::Interface() {
+        Register(FunctionTable, ARRAY_SIZE(FunctionTable));
+    }
+    
+    Interface::~Interface() {
+    }
+    
+} // namespace