[M] Change in coreboot[master]: mb/google/skyrim: override Markarth PCIe config

[John Su (Code Review)]

Attention is currently required from: John Su, Jason Nien, Paul Menzel, Chris Wang, Patrick Huang.

Hello build bot (Jenkins), Jason Nien, Chris Wang, Martin Roth, Karthik Ramasubramanian, Patrick Huang,

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

https://review.coreboot.org/c/coreboot/+/74133

to look at the new patch set (#4).

Change subject: mb/google/skyrim: override Markarth PCIe config
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mb/google/skyrim: override Markarth PCIe config

Because Markarth PCIe port 1 use for eMMc not SD. So we need override
PCIe config for Markarth. And also the Markarth have NVMe and eMMC
SKU. Follow Winterhold to look at the NVMe CLKREQ signal before
initializing the ports allowing us to identify which device is populated
and only initialize that device.

BRANCH=none
BUG=b:275669215
TEST=emerge-skyrim coreboot chromeos-bootimage

Signed-off-by: John Su 
Change-Id: I0b4e4067a30019d742c7589a52badf93b7091615
---
M src/mainboard/google/skyrim/Kconfig
M src/mainboard/google/skyrim/variants/markarth/Makefile.inc
A src/mainboard/google/skyrim/variants/markarth/port_descriptors.c
3 files changed, 120 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/33/74133/4