dt-bindings: arm: hisilicon: convert hisilicon,hip04-fabric bindings to json-schema

Convert the Hisilicon Fabric controller binding to DT schema format using
json-schema.

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Link: https://lore.kernel.org/r/20200929141454.2312-14-thunder.leizhen@huawei.com
Signed-off-by: Rob Herring <robh@kernel.org>