dt-bindings: bus: add CDX bus controller for versal net

Add CDX bus controller device tree bindings for versal-net
devices.

Signed-off-by: Nipun Gupta <nipun.gupta@amd.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@amd.com>
Tested-by: Nikhil Agarwal <nikhil.agarwal@amd.com>
Link: https://lore.kernel.org/r/20230313132636.31850-4-nipun.gupta@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>