There is no such thing. All changes/additions made to the aspect ratio for the PSP were quick fakes. Only with the lowest standards could you call what War of the Lions does a "16:9 presentation."
But the game wasn't simply a 4:3 screen stretched to 16:9. I've played the PSX version on the PSP, and it stretches the screen much more than the PSP version. And the cutscenes are in widescreen.