mb/system76/whl-u: Add System76 Galago Pro 3 Rev C

Tested with TianoCore payload (UefiPayloadPkg).

Working:

- PS/2 keyboard, touchpad
- Both DIMM slots
- NVMe port
- SATA port
- SD card slot
- Left USB 3 Type-A port
- Right USB 3 Type-A port
- Right USB 3 Type-C port
- Webcam
- Ethernet
- Integrated graphics using Intel GOP driver
- mDP output
- HDMI output
- Internal microphone
- Internal speakers
- 3.5mm audio input
- 3.5mm audio output
- S3 suspend/resume
- Flashing with flashrom
- Booting to Ubuntu Linux 20.10 and Windows 10

Not tested:

- Thunderbolt functionality

Change-Id: I5c992e603dbd57ae1b4ddc3a0f9bfc92d6acc813
Signed-off-by: Jeremy Soller <jeremy@system76.com>
Signed-off-by: Tim Crawford <tcrawford@system76.com>
---
A src/mainboard/system76/whl-u/Kconfig
A src/mainboard/system76/whl-u/Kconfig.name
A src/mainboard/system76/whl-u/Makefile.inc
A src/mainboard/system76/whl-u/acpi/gpe.asl
A src/mainboard/system76/whl-u/acpi/mainboard.asl
A src/mainboard/system76/whl-u/acpi/sleep.asl
A src/mainboard/system76/whl-u/acpi/tbt.asl
A src/mainboard/system76/whl-u/board_info.txt
A src/mainboard/system76/whl-u/bootblock.c
A src/mainboard/system76/whl-u/devicetree.cb
A src/mainboard/system76/whl-u/dsdt.asl
A src/mainboard/system76/whl-u/gpio.c
A src/mainboard/system76/whl-u/gpio_early.c
A src/mainboard/system76/whl-u/include/mainboard/gpio.h
A src/mainboard/system76/whl-u/ramstage.c
A src/mainboard/system76/whl-u/romstage.c
A src/mainboard/system76/whl-u/variants/galp3-c/board_info.txt
A src/mainboard/system76/whl-u/variants/galp3-c/data.vbt
A src/mainboard/system76/whl-u/variants/galp3-c/hda_verb.c
A src/mainboard/system76/whl-u/variants/galp3-c/overridetree.cb
20 files changed, 708 insertions(+), 0 deletions(-)