dt-bindings: interrupt-controller: qcom,pdc: document pdc on X1E80100

The X1E80100 SoC includes a PDC, document it.

Signed-off-by: Sibi Sankar <quic_sibis@quicinc.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20231124100608.29964-6-quic_sibis@quicinc.com


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