[M] Change in coreboot[main]: soc/intel/xeon_sp: Drop SOC_INTEL_MMAPVTD_ONLY_FOR_DPR

[Shuo Liu (Code Review)]

Attention is currently required from: Christian Walter, Johnny Lin, Jonathan Zhang, Lean Sheng Tan, Patrick Rudolph, Tim Chu.

Shuo Liu has posted comments on this change by Patrick Rudolph. ( https://review.coreboot.org/c/coreboot/+/85139?usp=email )

Change subject: soc/intel/xeon_sp: Drop SOC_INTEL_MMAPVTD_ONLY_FOR_DPR
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Patch Set 5: Code-Review+2