mb/system76/adl-p: Add Galago Pro 6 as a variant

The Galago Pro 6 (galp6) is an Alder Lake-P board.

Tested with a custom edk2 UefiPayloadPkg.

Working:

- PS/2 keyboard, touchpad
- Both DIMM slots (with NMSO480E82-3200EA00)
- M.2 NVMe SSD (with MZVL2500HCJQ)
- All USB ports
- All USB ports
- SD card reader
- Webcam
- Ethernet
- WiFi/Bluetooth
- Integrated graphics using Intel GOP driver
- Backlight controls on Windows 10 and Linux 6.1
- HDMI output
- DisplayPort output over USB-C
- Internal microphone
- Internal speakers
- Combined headphone + mic 3.5mm audio
- S0ix suspend/resume
- Booting Pop!_OS Linux 22.04 with kernel 6.0.6
- Internal flashing with flashrom v1.2-1087-gde016a17

Not working:

- Detection of devices in TBT slot on boot

Change-Id: I8940fb3777d7f18393ef50baec32f9445b375648
Signed-off-by: Tim Crawford <tcrawford@system76.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69211
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jeremy Soller <jeremy@system76.com>

Documentation/mainboard/system76/galp6.md

@@ -0,0 +1,61 @@
+# System76 Galago Pro 6 (galp6)
+
+## Specs
+
+- CPU
+  - Intel Core i5-1240P
+  - Intel Core i7-1260P
+- EC
+  - ITE IT5570E running [System76 EC](https://github.com/system76/ec)
+- Graphics
+  - Intel Iris Xe Graphics
+  - eDP 14.1" 1920x1080@60Hz LCD (Panda LM140LF2L02)
+  - 1x HDMI 2.1
+  - 1x DisplayPort 1.4 over USB-C
+- Memory
+  - Up to 64GB (2x32GB) dual-channel DDR4 SO-DIMMs @ 3200 MHz
+- Networking
+  - Gigabit Ethernet
+  - M.2 NVMe/CNVi WiFi/Bluetooth (Intel Wi-Fi 6 AX200/201)
+- Power
+  - 90W (19V, 4.74A) AC barrel adapter (Chicony A16-090P1A)
+  - USB-C charging, compatible with 90W+ chargers
+  - 53.35Wh 4-cell Lithium-ion battery (NV40BAT-4-53)
+- Sound
+  - Realtek ALC256 codec
+  - Internal speakers and microphone
+  - Combined 3.5mm headphone/microphone jack
+  - HDMI, USB-C DisplayPort audio
+- Storage
+  - M.2 PCIe NVMe Gen 4 SSD
+  - MicroSD card reader (OZ711LV2)
+- USB
+  - 1x USB-C Type-C with Thunderbolt 4
+  - 1x USB 3.2 (Gen 2) Type-C
+  - 2x USB 3.2 (Gen 1) Type-A
+- Dimensions
+  - 32.49cm x 22.5cm x 1.82cm, 1.45kg
+
+## Flashing coreboot
+
+```eval_rst
++---------------------+---------------------+
+| Type                | Value               |
++=====================+=====================+
+| Socketed flash      | no                  |
++---------------------+---------------------+
+| Vendor              | Macronix            |
++---------------------+---------------------+
+| Model               | MX25L25673G         |
++---------------------+---------------------+
+| Size                | 32 MiB              |
++---------------------+---------------------+
+| Package             | WSON-8              |
++---------------------+---------------------+
+| Internal flashing   | yes                 |
++---------------------+---------------------+
+| External flashing   | yes                 |
++---------------------+---------------------+
+```
+
+The flash chip (U43) is left of the wireless card.