[M] Change in coreboot[master]: drivers/intel/gma: Hook up libgfxinit in romstage

[Jérémy Compostella (Code Review)]

Attention is currently required from: Bora Guvendik, Anil Kumar K, Hannah Williams, Cliff Huang, Paul Menzel, Angel Pons, Arthur Heymans, Zhixing Ma, Tarun Tuli, Nico Huber, Michał Żygowski, Subrata Banik, Nick Vaccaro.

Hello Bora Guvendik, Anil Kumar K, Hannah Williams, Cliff Huang, Paul Menzel, Angel Pons, Arthur Heymans, Zhixing Ma, Tarun Tuli, Nico Huber, Michał Żygowski, Subrata Banik, Nick Vaccaro,

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

https://review.coreboot.org/c/coreboot/+/70276

to look at the new patch set (#2).

Change subject: drivers/intel/gma: Hook up libgfxinit in romstage
......................................................................

drivers/intel/gma: Hook up libgfxinit in romstage

A mainboard port needs to:

- select `CONFIG_ROMSTAGE_MAINBOARD_HAS_LIBGFXINIT'

- implement the Ada package `GMA.Mainboard' with a single function
  `ports' that returns a list of ports to be probed for displays.

- set the desired `GFX_GMA_DEFAULT_MMIO' IO memory address to use
  in romstage for the graphic device.

This CL requires the libgfxinit
https://review.coreboot.org/c/libgfxinit/+/69855 patch.

BUG=b:252792591
BRANCH=firmware-brya-14505.B
TEST=TO-BE-COMPLETED

Change-Id: I3c2101de10dc5df54fe873e43bbe0f1c4dccff44
Signed-off-by: Jeremy Compostella 
---
M src/arch/x86/car.ld
M src/device/Kconfig
M src/drivers/intel/gma/Kconfig
M src/drivers/intel/gma/Makefile.inc
4 files changed, 107 insertions(+), 11 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/76/70276/2