Change in coreboot[master]: mb/google/guybrush: Enable RTD3 support for NVMe

[Raul Rangel (Code Review)]

Attention is currently required from: Raul Rangel, Karthikeyan Ramasubramanian.
Hello build bot (Jenkins), Karthikeyan Ramasubramanian,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/54967

to look at the new patch set (#6).

Change subject: mb/google/guybrush: Enable RTD3 support for NVMe
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mb/google/guybrush: Enable RTD3 support for NVMe

This will tell the kernel to ignore PCI ASPM when suspending the device
and instead place the device into D3. We don't actually have a pin to
control power to the NVMe so we leave it in D3Hot. I'm not sure if
`PCI_RST#` is working correctly on S0i3 suspend/resume. If it's not
acting as expected we can add the reset GPIO and have the OS do it.

BUG=b:184617186
TEST=Run suspend_stress_test on guybrush for 10 cycles

Signed-off-by: Raul E Rangel 
Change-Id: I29539ac120a9f1b7c1bfeaca745cfc82acfa461a
---
M src/mainboard/google/guybrush/Kconfig
M src/mainboard/google/guybrush/variants/baseboard/devicetree.cb
2 files changed, 8 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/67/54967/6