Change in coreboot[master]: soc/intel/jasperlake: add pcie modphy settings

[Kane Chen (Code Review)]

Attention is currently required from: Jamie Chen, Patrick Rudolph.
Kane Chen has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/56336 )

Change subject: soc/intel/jasperlake: add pcie modphy settings
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Patch Set 1:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/56336/comment/0e05b47f_89b36539 
PS1, Line 9: This patch expose some pcie modphy UPDs/configuration
           : to be filled from devicetree. It's for fine tune pcie
           : port signal quality.
> This patch adds device tree settings to control pcie modphy tuning FSP UPDS.  […]

This patch adds device tree settings to control pcie modphy tuning FSP UPDS. 
With this patch, the pcie modphy can be tuned per board.