dt-bindings: interconnect: split SC8280XP to own schema

SC8280XP comes with interconnects without IO address space, so split it
from common file for easier maintenance and to fix warnings like:

  sc8280xp-lenovo-thinkpad-x13s.dtb: interconnect-mc-virt: '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/20230111092637.17946-2-krzysztof.kozlowski@linaro.org


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