Change in coreboot[master]: soc/intel/alderlake: Refactor IGD initialization using FSP UPD

[Subrata Banik (Code Review)]

Attention is currently required from: Furquan Shaikh, Paul Menzel, Subrata Banik, Angel Pons, Patrick Rudolph.
Hello build bot (Jenkins), Nico Huber, Furquan Shaikh, Tim Wawrzynczak, Angel Pons, Patrick Rudolph,

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

https://review.coreboot.org/c/coreboot/+/49291

to look at the new patch set (#9).

Change subject: soc/intel/alderlake: Refactor IGD initialization using FSP UPD
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soc/intel/alderlake: Refactor IGD initialization using FSP UPD

This patch ensures skipping IGD initialization as part of GFX PEIM and
make IGD disable when mainboard user selects SOC_INTEL_DISABLE_IGD.

TEST=Able to get depthcharge pre-OS splash screen with AMD Radeon RX
5700 PCI-E DGPU when mainboard user selects SOC_INTEL_DISABLE_IGD.

Change-Id: Ibbe9c8c4d77018de83815d7d203284b1fbc0da58
Signed-off-by: Subrata Banik 
---
M src/soc/intel/alderlake/fsp_params.c
M src/soc/intel/alderlake/romstage/fsp_params.c
2 files changed, 13 insertions(+), 10 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/91/49291/9