Fps limit off request

[gid15]

r2945 includes a new menu entry to change the PSP clock speed.
Does it help to make these games run faster?
With this option, the speed of the Cube Demo can be changed:
- 50%: 30 FPS
- 75%: 45 FPS
- normal speed: 60 FPS
- 150%: 90 FPS
- 200%: 120 FPS
- 300%: 180 FPS

If not, then these games are already running at the limit of the PSP capabilities and cannot be changed to run faster...