[U-Boot] x86 FSP 2

Hi Bin,

I'm looking at Apollo Lake and it seems to use a newer FSP version (2.0). The API differences seem to be fairly minor but the packaging seems a little more complicated.

I'm thinking of introducing a Kconfig for this and moving the existing fsp implementation into an arch/x86/lib/fsp1 directory and adding an fsp2 there also. What do you think? Have you done anything with this newer version?

Regards, Simon