Change in coreboot[master]: mb/google/guybrush: Enable PCIe Power Management and Clock Features

[Matt Papageorge (Code Review)]

Attention is currently required from: Jason Glenesk, Raul Rangel, Martin Roth, Furquan Shaikh, Marshall Dawson, Eric Peers, Felix Held.
Matt Papageorge has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/54282 )

Change subject: mb/google/guybrush: Enable PCIe Power Management and Clock Features
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Patch Set 6:

(1 comment)

File src/mainboard/google/guybrush/port_descriptors.c:

https://review.coreboot.org/c/coreboot/+/54282/comment/084ab5c6_cea798e4 
PS6, Line 16: 		.link_aspm = ASPM_L1,
Descriptor switches are needed so AGESA can adjust some needed straps