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 <jeremy@system76.com>
Signed-off-by: Tim Crawford <tcrawford@system76.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47822
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/configs/config.system76_gaze15 b/configs/config.system76_gaze15
new file mode 100644
index 0000000..98d0c4b
--- /dev/null
+++ b/configs/config.system76_gaze15
@@ -0,0 +1,5 @@
+CONFIG_VENDOR_SYSTEM76=y
+CONFIG_BOARD_SYSTEM76_GAZE15=y
+CONFIG_PAYLOAD_TIANOCORE=y
+CONFIG_RUN_FSP_GOP=y
+CONFIG_SMMSTORE=y