Change in coreboot[master]: mediatek/mt8183: Set DRAM voltage for each DRAM frequency

[Hung-Te Lin (Code Review)]

Hung-Te Lin has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/35017 )

Change subject: mediatek/mt8183: Set DRAM voltage for each DRAM frequency
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Patch Set 11: Code-Review-1

@huayang, please remove the +2 and address the feedbacks in comments.

also I really think we can avoid the use of '#if Xplease try to avoid @huayaXX'.