arm64: dts: mediatek: Introduce the MT8395 Radxa NIO 12L board

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.com
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>