arm64: dts: rockchip: rk3588: Add Edgeble Neu6 Model A IO

Neural Compute Module 6(Neu6) IO board is an industrial form factor
ready-to-use IO board from Edgeble AI.

IO board offers plenty of peripherals and connectivity options and
this patch enables basic eMMC and UART which is enough to successfully
boot Linux.

Neu6 needs to mount on top of this IO board in order to create a
complete Edgeble Neural Compute Module 6(Neu6) IO platform.

Add support for Edgeble Neu6 Model A IO Board.

Signed-off-by: Jagan Teki <jagan@edgeble.ai>
Link: https://lore.kernel.org/r/20230110134658.820691-3-jagan@edgeble.ai


Signed-off-by: Heiko Stuebner <heiko@sntech.de>