Service: Move SRV interface to a new sm/ subdirectory

This will contain the implementation of the sm (Service Manager) system
module.

src/core/hle/service/sm/srv.h

@@ -0,0 +1,25 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <string>
+#include "core/hle/service/service.h"
+
+namespace Service {
+namespace SM {
+
+/// Interface to "srv:" service
+class SRV final : public Interface {
+public:
+    SRV();
+    ~SRV() override;
+
+    std::string GetPortName() const override {
+        return "srv:";
+    }
+};
+
+} // namespace SM
+} // namespace Service