dt-bindings: interrupt-controller: qcom,pdc: Add SDM670

Like all other RPMh-enabled SoCs, SDM670 includes a PDC. Document it.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230811-topic-tlmm_wakeup-v1-1-5616a7da1fff@linaro.org


Signed-off-by: Rob Herring <robh@kernel.org>