Add a device tree for the Radxa NIO 12L SBC, powered by the MediaTek
MT8395 Genio 1200 SoC.

This board features:
 * MT6359 + MT6360 PMICs at I2C-6
   - Regulators, battery charger, TypeC Port Controller Interface
   - Audio through 3.5mm jack (2CH out, 1CH in)
 * Two MT6315 PMICs over SPMI
   - CPU-Big and GPU Core regulators
 * Network Connectivity
   - Realtek RTL8211FD MDIO PHY/Transceiver, 10/100/1000M Ethernet
   - MT7921E WiFi (PCIe1) / Bluetooth (USB 2.0) combo chip
 * Storage
   - On-board UFS storage
   - On-board eMMC on MMC0 controller
   - MicroSD card slot on MMC1 controller
 * Other connectivity
   - 1x USB Type-C Charging/Power only port
   - 1x USB 3.2 SuperSpeed Type-C OTG+DisplayPort mode
     - Muxed by ITE IT5205 Alternate Mode Passive MUX
   - 4x USB 3.0 Type-A ports on VL805 USB Hub (PCIe0)
   - 1x HDMI IN port
   - 1x HDMI OUT port
   - 1x MIPI DSI (Display) port
   - 2x MIPI CSI (Camera) ports
 * 40-pin Expansion Header
   - Two UART ports
   - I2C, SPI busses
   - I2S for external audio chips
   - ADC
   - GPIOs

Link: https://lore.kernel.org/r/20240202114821.79227-3-angelogioacchino.delregno@collabora.comSigned-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>