Change in coreboot[master]: Revert "soc/mediatek: Add PCIe support"

[Hung-Te Lin (Code Review)]

Hung-Te Lin has abandoned this change. ( https://review.coreboot.org/c/coreboot/+/62678 )

Change subject: Revert "soc/mediatek: Add PCIe support"
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Abandoned

let's fix the implementation instead