Remove lots more 3DS-specific code.

src/core/hle/service/ns/ns.h

@@ -1,16 +0,0 @@
-// Copyright 2017 Citra Emulator Project
-// Licensed under GPLv2 or any later version
-// Refer to the license.txt file included.
-
-#pragma once
-
-#include "core/hle/service/service.h"
-
-namespace Service {
-namespace NS {
-
-/// Registers all NS services with the specified service manager.
-void InstallInterfaces(SM::ServiceManager& service_manager);
-
-} // namespace NS
-} // namespace Service