hle: Add service stubs for apm and appletOE.

src/core/hle/service/apm/apm.cpp

@@ -0,0 +1,27 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "common/logging/log.h"
+#include "core/hle/ipc_helpers.h"
+#include "core/hle/service/apm/apm.h"
+
+namespace Service {
+namespace APM {
+
+void InstallInterfaces(SM::ServiceManager& service_manager) {
+    std::make_shared<APM>()->InstallAsService(service_manager);
+}
+
+APM::APM() : ServiceFramework("apm") {
+    static const FunctionInfo functions[] = {
+        {0x00000000, nullptr, "OpenSession"},
+        {0x00000001, nullptr, "GetPerformanceMode"},
+    };
+    RegisterHandlers(functions);
+}
+
+APM::~APM() = default;
+
+} // namespace APM
+} // namespace Service