Change in coreboot[master]: mb/system76/gaze15: Add System76 Gazelle 15

[Tim Crawford (Code Review)]

Attention is currently required from: Martin Roth, Jeremy Soller, Paul Menzel, Angel Pons.
Hello build bot (Jenkins), Patrick Georgi, Martin Roth, Jeremy Soller, Paul Menzel, Angel Pons,

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

https://review.coreboot.org/c/coreboot/+/47822

to look at the new patch set (#10).

Change subject: mb/system76/gaze15: Add System76 Gazelle 15
......................................................................

mb/system76/gaze15: Add System76 Gazelle 15

Tested with TianoCore payload (UefiPayloadPkg).

Working:

- PS/2 keyboard, touchpad
- Both DIMM slots
- Both NVMe ports
- SATA port
- All USB ports
- Webcam
- Ethernet
- Integrated graphics using Intel GOP driver
- Internal microphone
- Internal speakers
- S3 suspend/resume
- Flashing with flashrom
- Booting to Ubuntu Linux 20.10 and Windows 10

Not working:

- Discrete/Hybrid graphics

This requires a new driver to work correctly, which will be added and
enabled later.

Change-Id: I10667fa26ac7c4b8eb67da11f3e963062bd0db47
Signed-off-by: Jeremy Soller 
Signed-off-by: Tim Crawford 
---
M Documentation/mainboard/index.md
A Documentation/mainboard/system76/gaze15.md
A configs/config.system76_gaze15
A src/mainboard/system76/gaze15/Kconfig
A src/mainboard/system76/gaze15/Kconfig.name
A src/mainboard/system76/gaze15/Makefile.inc
A src/mainboard/system76/gaze15/acpi/gpe.asl
A src/mainboard/system76/gaze15/acpi/mainboard.asl
A src/mainboard/system76/gaze15/acpi/sleep.asl
A src/mainboard/system76/gaze15/board_info.txt
A src/mainboard/system76/gaze15/bootblock.c
A src/mainboard/system76/gaze15/data.vbt
A src/mainboard/system76/gaze15/devicetree.cb
A src/mainboard/system76/gaze15/dsdt.asl
A src/mainboard/system76/gaze15/gpio.c
A src/mainboard/system76/gaze15/gpio_early.c
A src/mainboard/system76/gaze15/hda_verb.c
A src/mainboard/system76/gaze15/include/mainboard/gpio.h
A src/mainboard/system76/gaze15/ramstage.c
A src/mainboard/system76/gaze15/romstage.c
20 files changed, 832 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/22/47822/10