arm64: dts: rockchip: Add devicetree for the Graperain G3568 v2

The Graperain G3568 v2 is an RK3568-based development board, just like
the RK3568-EVB.
It always uses soldered connections between the GR3568CV2 core board and
the RK3568BV2/GR3568BV2 I/O board.

The G3568 board has multiple hardware revisions, and we currently
support v2 (I/O board).

Specification:
- SoC: RockChip RK3568 ARM64 (4 cores)
- eMMC: 16-128 GB
- RAM: 2-16 GB
- Power: DC 12V 2A
- Ethernet: 2x RTL8211F RGMII (10/100/1000 Mbps)
- Wireless radio: 802.11b/g/n/ac dual-band
- LED:
  Power: AlwaysOn
  User: GPIO
- Button:
  ESC: SARADC/0 <1100k µV>
  MENU: SARADC/0 <1400k µV>
  VOL-: SARADC/0 <430k µV>
  VOL+: SARADC/0 <50k µV>
  Power/Reset: PMIC RK809
- CAN
  CAN/1: 4-pin (PH 2.0)
- PWM
  PWM/4: Backlight
  PWM/5: Backlight
  PWM/7: IR Receiver
- UART:
  UART/2: Debug TTL - 1500000 8N1 (1.25mm)
  UART/3: TTL (PH 2.0)
  UART/4: TTL (PH 2.0)
  UART/8: AP6356S Bluetooth
  UART/9: TTL (PH 2.0)
- I2C:
  I2C/0: PMIC RK809
  I2C/1: Touchscreen
  I2C/4: Camera
  I2C/5: RTC@51 PCF8563
- I2S:
  I2S/0: HDMI Sound
  I2S/1: RK809 Audio Codec
  I2S/3: AP6356S Bluetooth Sound
- SDMMC:
  SDMMC/0: microSD (TF) slot
  SDMMC/2: AP6356S SDIO WiFi card
- Camera: 1x CSI
- Video: HDMI / DSI0 (MIPI/LVDS) / DSI1 (MIPI/EDP)
- Audio: HDMI / MIC / Speaker / SPDIF / 3.5mm Headphones / AP6356S Bluetooth
- USB:
  USB 2.0 HOST x2
  USB 2.0 OTG x1 (shared with USB 3.0 OTG/HOST)
  USB 3.0 HOST x1
  USB 3.0 OTG/HOST x1
- SATA: 1x SATA 3.0 with Power/4-pin
- PCIe: 1x PCIe 3.0 x2 (x4 connector)

Link:
- https://image.chukouplus.com/upload/C_153/product_file/20211022/6daddec9e400458816dd4c57ba807fc3.pdf
- https://blog.gov.cooking/archives/research-graperain-g3568-v2-and-flash.html

Signed-off-by: Coia Prant <coiaprant@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch> #gmac and mdio nodes
Link: https://patch.msgid.link/20260702204628.2407308-5-coiaprant@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

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