Change in coreboot[master]: soc/amd/cezanne/fsp_m_params:Configure the iommu_support UPD

[Felix Held (Code Review)]

Attention is currently required from: Jason Glenesk, Raul Rangel, Marshall Dawson, Matt Papageorge, Karthik Ramasubramanian.
Felix Held has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/56770 )

Change subject: soc/amd/cezanne/fsp_m_params:Configure the iommu_support UPD
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Patch Set 1:

(1 comment)

File src/soc/amd/cezanne/fsp_m_params.c:

https://review.coreboot.org/c/coreboot/+/56770/comment/2a64e094_ae422186 
PS1, Line 213: 	mcfg->iommu_support = config->iommu_support;
> wouldn't it be better to see if the pci device is enabled in devicetree instead of introducing anoth […]

since the iommu pci device is on bus 0, you can probably use is_devfn_enabled for that