Change in coreboot[master]: soc/mediatek: Add timestamp to measure PERST# time

[Hung-Te Lin (Code Review)]

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

Change subject: soc/mediatek: Add timestamp to measure PERST# time
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Patch Set 10:

(1 comment)

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

https://review.coreboot.org/c/coreboot/+/62933/comment/9779d282_ad750480 
PS10, Line 249: 		mtk_pcie_reset(conf->base + PCIE_RST_CTRL_REG, true);
> We should mdelay(100) in this case (and print a warning).

no need to mdelay 100 - the perst_time_us (0) will sleep enough time later.