dt-bindings: hwlock: qcom-hwspinlock: correct example indentation

Use some consistent indentation (4-space) for DTS example.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220909092035.223915-3-krzysztof.kozlowski@linaro.org