Change in coreboot[master]: soc/amd/cezanne: Add modern standby option to chip config

[Karthik Ramasubramanian (Code Review)]

Attention is currently required from: Jason Glenesk, Raul Rangel, Furquan Shaikh, Mathew King, Felix Held.
Karthik Ramasubramanian has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/52041 )

Change subject: soc/amd/cezanne: Add modern standby option to chip config
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Patch Set 6:

(1 comment)

File src/soc/amd/cezanne/Kconfig:

https://review.coreboot.org/c/coreboot/+/52041/comment/58125796_3b2c4a99 
PS3, Line 216: AMD_ENABLE_MODERN_STANDBY
> I don't feel like I understand the benefit of separate S3/S0ix builds over a runtime setting. […]

I would prefer a single build supporting both S3 and S0i3, instead of maintaining separate builds for that. Run-time config is going to help switch between S3 and S0i3 easily.

Based on the way Kconfig is being used to enable S0i3, I dont see any code-space savings too.