[coreboot-gerrit] Change in coreboot[master]: soc/amd/cezanne: Add uart.c to smm so we can support DEBUG_SMI

[Felix Held (Code Review)]

Attention is currently required from: Jason Glenesk, Raul Rangel, Martin Roth, Marshall Dawson.
Felix Held has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/50617 )

Change subject: soc/amd/cezanne: Add uart.c to smm so we can support DEBUG_SMI
......................................................................

Patch Set 1: Code-Review+2