dt-bindings: remoteproc: qcom,sm8550-pas: require memory-region

The memory-region is defined in device specific binding, not in
qcom,pas-common.yaml, thus also require it in the same place.

Fixes: 084258d6 ("dt-bindings: remoteproc: qcom: adsp: document sm8550 adsp, cdsp & mpss compatible")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230713072242.11268-4-krzysztof.kozlowski@linaro.org


Signed-off-by: Bjorn Andersson <andersson@kernel.org>