dt-bindings: remoteproc: qcom,sm6115-pas: correct memory-region constraints

dt-bindings: remoteproc: qcom,sm6115-pas: correct memory-region constraints

Qualcomm PAS devices expect exactly one memory region, not many.  Also,
the memory-region is now defined in device specific binding, not in
qcom,pas-common.yaml, thus also require it in the same place.

Fixes: 838c558bb8bc ("dt-bindings: remoteproc: qcom: Add sm6115 pas yaml file")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230713072242.11268-3-krzysztof.kozlowski@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>