Change in coreboot[master]: soc/mediatek: Add mtk_early_init for passing data across sessions

[Rex-BC Chen (Code Review)]

Attention is currently required from: Hung-Te Lin, Paul Menzel, Angel Pons, Yu-Ping Wu, Jianjun Wang.
Rex-BC Chen has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/63019 )

Change subject: soc/mediatek: Add mtk_early_init for passing data across sessions
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Patch Set 1:

(1 comment)

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

https://review.coreboot.org/c/coreboot/+/63019/comment/8ec52dd0_f834f480 
PS1, Line 25: void mtk_pcie_save_timestamp(void)
Will it better if we move these pcie function to common/pcie.c?