Change in coreboot[master]: src/device/dram/ddr: Deduplicate enum spd_dimm_type_ddr{2,3,4}

[Paul Menzel (Code Review)]

Attention is currently required from: Jakub Czapiga, Angel Pons, Patrick Rudolph, Elyes Haouas.
Paul Menzel has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/62181 )

Change subject: src/device/dram/ddr: Deduplicate enum spd_dimm_type_ddr{2,3,4}
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Patch Set 5: Code-Review+1