mb/system76/adl: Add Gazelle 17 as a variant

The gaze17 comes in 2 variants due to differences in the discrete GPU
and network controller used.

- NVIDIA RTX 3050, using Realtek Ethernet Controller
- NVIDIA RTX 3060, using onboard I219-V Ethernet Controller

Tested with a custom TianoCore UefiPayloadPkg payload.

Working:

- PS/2 keyboard, touchpad
- Both DIMM slots
- M.2 NVMe SSD
- M.2 SATA SSD
- MicroSD card reader
- All USB ports
- Webcam
- Ethernet
- WiFi/Bluetooth
- Integrated graphics using Intel GOP driver
- Internal microphone
- Internal speakers
- Combined headphone + mic 3.5mm audio
- 3.5mm microphone input
- S0ix suspend/resume
- Booting to Pop!_OS Linux 22.04 with kernel 6.2.6
- Internal flashing with flashrom v1.2-703-g76118a7c10ed

Not working:

- Discrete/Hybrid graphics: Requires NVIDIA driver
- mDP/HDMI displays on 3060 variant: Requires NVIDIA driver
- Detection of devices in TBT slot on boot
- S3 suspend: MP init eventually fails

Not tested:

- Thunderbolt devices

Change-Id: Ib12ac47e8f34004f72e6234039823530511baea7
Signed-off-by: Jeremy Soller <jeremy@system76.com>
Signed-off-by: Tim Crawford <tcrawford@system76.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63990
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/system76/adl/Kconfig.name

@@ -4,6 +4,12 @@ config BOARD_SYSTEM76_DARP8
 config BOARD_SYSTEM76_GALP6
 	bool "galp6"
 
+config BOARD_SYSTEM76_GAZE17_3050
+	bool "gaze17 3050"
+
+config BOARD_SYSTEM76_GAZE17_3060_B
+	bool "gaze17 3060-b"
+
 config BOARD_SYSTEM76_LEMP11
 	bool "lemp11"