arm64: dts: rockchip: Add common DT for edgeble-neu6b-io

Edgeble Neu6a and Neu6b are compatible with common IO board.

So, maintain the IO board in rk3588-edgeble-neu6a-io.dtsi.

Signed-off-by: Jagan Teki <jagan@edgeble.ai>
Link: https://lore.kernel.org/r/20231125190522.87607-4-jagan@edgeble.ai
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arm64: dts: rockchip: move rk3588 serial aliases to soc dtsi

The serial ports on rk3588 are named uart0 - uart9. Board schematics
also use these exact numbers and we want those names to also reflect
in the OS devices because everything else would just cause confusion.

To prevent each board repeating their list of serial aliases, move them
to the soc dtsi, as all previous Rockchip soc do already.

Signed-off-by: Heiko Stuebner <heiko.stuebner@cherry.de>
Reviewed-by: Dragan Simic <dsimic@manjaro.org>
Link: https://lore.kernel.org/r/20231205164842.556684-2-heiko@sntech.de

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>