Vibration strenght is always at 100% in Metal Gear Solid

[DamianPereira]

Hi! In the options menu when you boot metal gear solid with a dual-shock controller, there's a vibration test option, which has weak and strong test options. On Duckstation the strong and weak vibration are clearly different. In the config there's even a large motor and small motor mappings from SDL.

Is this something that can be fixed on the swanstation end? Or would it require for libretro to support sdl.