dt-bindings: interconnect: split SC7280 to own schema

SC7280 comes with interconnects having and missing IO address space, so
split it from common file for easier maintenance and to fix warnings like:

  sc7280-herobrine-crd.dtb: interconnect: 'reg' is a required property

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230111092637.17946-1-krzysztof.kozlowski@linaro.org


Signed-off-by: Georgi Djakov <djakov@kernel.org>