dt-bindings: interrupt-controller: Convert mrvl,intc to json-schema

Convert the mrvl,intc binding to DT schema format using json-schema.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Link: https://lore.kernel.org/r/20200616223353.993567-4-lkundrak@v3.sk


Signed-off-by: Rob Herring <robh@kernel.org>