arm64: dts: allwinner: h616: Add BigTreeTech Pi support

arm64: dts: allwinner: h616: Add BigTreeTech Pi support

The BigTreeTech Pi is an H616 based board based on CB1.
Just in Rpi format board.

It features the same internals as BTT CB1 but adds:
    - Fan port
    - IR receiver
    - ADXL345 Accelerometer connector via SPI
    - 24V DC power supply via terminal plugs
    - USB to CAN module connector (External Module)

List of currently working things is same as BTT CB1 but also:
    - IR receiver
    - ADXL345 connector

Signed-off-by: Martin Botka <martin@biqu3d.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/r/20230912-b4-cb1-v6-4-bb11238f3a9c@somainline.org
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>