dt-bindings: interconnect: Convert Allwinner MBUS controller to a schema

The older Allwinner SoCs have an MBUS controller that is used by Linux,
with a matching Device Tree binding.

Now that we have the DT validation in place, let's convert the device tree
bindings for that controller over to a YAML schemas.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Signed-off-by: Rob Herring <robh@kernel.org>