Change in coreboot[master]: soc/intel/common/block/pcie/rtd3: Add PM methods to the device.

[Tim Wawrzynczak (Code Review)]

Attention is currently required from: Lance Zhao, Anil Kumar K, Cliff Huang, Selma Bensaid, Paul Menzel, Thejaswani Putta, Patrick Rudolph.
Tim Wawrzynczak has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/61352 )

Change subject: soc/intel/common/block/pcie/rtd3: Add PM methods to the device.
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Patch Set 2:

(1 comment)

File src/soc/intel/common/block/pcie/rtd3/chip.h:

https://review.coreboot.org/c/coreboot/+/61352/comment/d36381ff_79a81351 
PS1, Line 53: ext_pm_support
> Hi Tim, […]

Actually this file would be included in `static.c`, therefore devicetrees that use this driver will be able to use things defined in this file, so I think the enum should work just fine, The table is nice, though!