[coreboot-gerrit] Change in coreboot[master]: soc/amd{common,cezanne}: Move pcie_gpp.c to common

[Felix Held (Code Review)]

Attention is currently required from: Jason Glenesk, Raul Rangel, Marshall Dawson.
Felix Held has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/54026 )

Change subject: soc/amd{common,cezanne}: Move pcie_gpp.c to common
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Patch Set 1: Code-Review+2