dt-bindings: remoteproc: qcom,adsp: simplify interrupts

Interrupts between variants differ only with presence of last optional
interrupt, so the constraints can be simplified.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220517070113.18023-5-krzysztof.kozlowski@linaro.org