board: rockchip: Add support for 9Tripod X3568 v4

The 9Tripod X3568 v4 is an RK3568-based SBC, just like the RK3568-EVB.
It always uses soldered connections between the X3568CV2/X3568CV3/X3568CV4 core board
and the X3568bv4 I/O board.

The differences between the core boards
- PCB size, layout
- CPU (RK3568B2/RK3568J)
- Memory type (DDR4/LPDDR4/LPDDR4X) and size
- eMMC size
- DSI/EDP resistor values
Although the components vary, they maintain full compatibility.

The X3568 board has multiple hardware revisions, and we currently support v4 (I/O board).

Specification:
- SoC: RockChip RK3568 ARM64 (4 cores)
- eMMC: 16-128 GB
- RAM: 2-16 GB
- Power: DC 12V 2A
- Ethernet: 2x YT8521SC RGMII (10/100/1000 Mbps)
- Wireless radio: 802.11b/g/n/ac/ax dual-band
- LED:
  Power: AlwaysOn
  User: GPIO
- Button:
  VOL+: SARADC/0 <35k µV>
  VOL-: SARADC/0 <450k µV>
  Power/Reset: PMIC RK809
- CAN
  CAN/1: 4-pin (PH 2.0)
- PWM
  PWM/4: Backlight DSI/0 DSI/1
  PWM/7: IR Receiver [may not install]
- UART:
  UART/2: Debug TTL - 1500000 8N1 (1.25mm)
  UART/3: TTL (PH 2.0)
  UART/4: TTL (PH 2.0)
  UART/8: AP6275S Bluetooth
  UART/9: TTL (PH 2.0)
- I2C:
  I2C/0: PMIC RK809
  I2C/1: Touchscreen DSI/0 DSI/1
  I2C/4: Camera
  I2C/5: RTC@51 PCF8563
- I2S:
  I2S/0: miniHDMI Sound
  I2S/1: RK809 Audio Codec
  I2S/3: AP6275S Bluetooth Sound
- SDMMC:
  SDMMC/0: microSD (TF) slot
  SDMMC/2: AP6275S SDIO WiFi card
- Camera: 1x CSI
- Video: miniHDMI / DSI0 (MIPI/LVDS) / DSI1 (MIPI/EDP)
- Audio: miniHDMI / MIC on-board / Speaker / SPDIF / 3.5mm Headphones / AP6275S Bluetooth
- USB:
  USB 2.0 HOST x2
  USB 2.0 HOST x3 (4-pin)
  USB 2.0 OTG x1 (shared with USB 3.0 OTG/HOST) [slot may not install]
  USB 3.0 HOST x1
  USB 3.0 OTG/HOST x1
- SATA: 1x SATA 3.0 with Power/4-pin [slot may not install]
- PCIe: 1x PCIe 3.0 x2 (x4 connector) [power/clock/slot may not install]

Link:
- https://appletsapi.52solution.com/media/X3568V4%E5%BC%80%E5%8F%91%E6%9D%BF%E7%A1%AC%E4%BB%B6%E6%89%8B%E5%86%8C.pdf
- https://blog.gov.cooking/archives/research-ninetripod-x3568-v4-and-flash.html

Signed-off-by: Coia Prant <[email protected]>
Reviewed-by: Quentin Schulz <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Quentin Schulz <[email protected]>

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