Change in coreboot[master]: soc/mediatek: Ensure PERST# deassertion time follows the spec

[Yu-Ping Wu (Code Review)]

Attention is currently required from: Hung-Te Lin, Rex-BC Chen, Paul Menzel, Angel Pons, Jianjun Wang.
Yu-Ping Wu has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/62933 )

Change subject: soc/mediatek: Ensure PERST# deassertion time follows the spec
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Patch Set 14:

(2 comments)

File src/soc/mediatek/common/pcie.c:

https://review.coreboot.org/c/coreboot/+/62933/comment/0d537934_c8547393 
PS14, Line 252: pre-initialize is not found, assert PERST# and sleep 100ms to met the delay requirement
early init data not found; sleeping 100ms

https://review.coreboot.org/c/coreboot/+/62933/comment/7343e776_e481fae8 
PS14, Line 257: PERST# assert time %lld us is not enough for link up, sleep %lld us to met the 100ms delay requirement
Need an extra %lld us delay to meet PERST# deassertion requirement