dt-bindings: arm: rockchip: Add Edgeble Neural Compute Module 2

Neural Compute Module 2(Neu2) is a 96boards SoM-CB compute module
based on Rockchip RV1126 from Edgeble AI.

Edgeble Neural Compute Module 2(Neu2) IO board is an industrial
form factor evaluation board from Edgeble AI.

Neu2 needs to mount on top of this IO board in order to create complete
Edgeble Neural Compute Module 2(Neu2) IO platform.

Add dt-bindings for it.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jagan Teki <jagan@edgeble.ai>
Acked-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20221129075424.189655-7-jagan@edgeble.ai
Signed-off-by: Heiko Stuebner <heiko@sntech.de>