pm: add support for maintenance mode

stratosphere/pm/source/pm_boot_mode.hpp

@@ -28,6 +28,8 @@ class BootModeService final : public IServiceObject {
         /* Actual commands. */
         void GetBootMode(Out<u32> out);
         void SetMaintenanceBoot();
+    public:
+        static void SetMaintenanceBootForEmbeddedBoot2();
     public:
         DEFINE_SERVICE_DISPATCH_TABLE {
             MakeServiceCommandMeta<BootMode_Cmd_GetBootMode, &BootModeService::GetBootMode>(),