UI: Toggle to select PSP models (1000, 2000/3000)

I think may not be all ppl here agree to have this option here.

Default now is PSP-1000

PSP-1000 - for homebrew
PSP-2000 - for multiplayer game like FF Type-0 , God Eat Buster 2

There are some games required PSP-2000 to run properly , like Killzone Liberation , WWE SMVR 2011