dt-bindings: arm: qcom,coresight-tpda: fix indentation in the example

Fix triple-space indentation to double-space in the example DTS.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20240325104007.30723-2-krzysztof.kozlowski@linaro.org