[coreboot] Trying to port Intel Truxton to CAR

[Noé Rubinstein]

NOT TO MERGE 
Signed-off-by: Noé Rubinstein

I'm trying to port Intel Truxton to CAR. So far, serial output works and Coreboot fails during SPD dump. If I remove the SPD dump, serial output doesn't work anymore (??).

I have been told on the chan to post my current progress here. The patch is not meant to be used as-is, and contains a lot of unrelated code, as I was explicitly requested to leave things as they are.