Change in coreboot[master]: soc/amd/cezanne: Add GRXS and GTXS method

[Felix Held (Code Review)]

Attention is currently required from: Jason Glenesk, Raul Rangel, Martin Roth, Marshall Dawson, Mathew King, Ivy Jian, EricR Lai.
Felix Held has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/52184 )

Change subject: soc/amd/cezanne: Add GRXS and GTXS method
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Patch Set 1:

(1 comment)

Patchset:

PS1:
> that's what i was planning for this; i'll take over this one

had a look and i'll probably do the moving to common code as a follow-up patch, since stoneyridge is sufficiently different and i'll have to find out if that one could also just use the same code as picasso and cezanne