Remove lots more 3DS-specific code.

src/core/hle/service/ns/ns.cpp

@@ -1,16 +0,0 @@
-// Copyright 2017 Citra Emulator Project
-// Licensed under GPLv2 or any later version
-// Refer to the license.txt file included.
-
-#include "core/hle/service/ns/ns.h"
-#include "core/hle/service/ns/ns_s.h"
-
-namespace Service {
-namespace NS {
-
-void InstallInterfaces(SM::ServiceManager& service_manager) {
-    std::make_shared<NS_S>()->InstallAsService(service_manager);
-}
-
-} // namespace NS
-} // namespace Service