AcpiPlatformDxe solely performs one-time tasks and does not expose any services or create any events. Hence it can safely be unloaded after the Entry Point execution by returning an error code. V2: Return EFI_REQUEST_UNLOAD_IMAGE. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Marvin Haeuser <Marvin.Haeuser@outlook.com> Reviewed-by: Star Zeng <star.zeng@intel.com>