[S] Change in coreboot[master]: soc/amd/mendocino: Force resets to be cold

[Tim Van Patten (Code Review)]

Attention is currently required from: Jason Glenesk, Raul Rangel, Martin L Roth, Matt DeVillier, Fred Reitberger.

Tim Van Patten has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/72486 )

Change subject: soc/amd/mendocino: Force resets to be cold
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Patch Set 3: Code-Review+1

(1 comment)

File src/soc/amd/mendocino/fch.c:

https://review.coreboot.org/c/coreboot/+/72486/comment/18e38c2e_fd172518 
PS3, Line 131: 	pm_write16(PWR_RESET_CFG, pm_read16(PWR_RESET_CFG) | TOGGLE_ALL_PWR_GOOD);
For my own sake, why is this necessary?

Is this affecting cold boots today also, and if so, should it be separated so it's not lost if the rest of this CL is reverted (due to warm boots being fixed)?