Change in coreboot[master]: [WIP]amdfwtool: Use relative address for EFS gen2

[Eric Peers (Code Review)]

Attention is currently required from: Bao Zheng, Martin Roth, Marshall Dawson, Kangheui Won, Paul Menzel, Zheng Bao, Karthikeyan Ramasubramanian, Felix Held.
Eric Peers has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/56438 )

Change subject: [WIP]amdfwtool: Use relative address for EFS gen2
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Patch Set 2:

(2 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/56438/comment/b408b451_b7963e28 
PS2, Line 9: The second generation EFS (offset 0x24[0]=0) uses
           : "binary relative" offsets and not "x86 physical
           : MMIO address" like gen1.
           : 
           : Chips like Cezanne can run in both cases, so no problem
           : comes up so far.
           : 
           : TODO: Need to fix the problem in psp_verstage.
> Please re-flow for 75 characters per line.

if this breaks psp_verstage, why are you putting it up for review?

https://review.coreboot.org/c/coreboot/+/56438/comment/d306e6dc_09089faa 
PS2, Line 19: Test=Majolica (Cezanne)
need to test on guybrush as well since Majolica doesn't have the TPM that guybrush does.