dt-bindings: qcom,pdc: document QCS8300 Power Domain Controller

Document Power Domain Controller for Qualcomm QCS8300. PDC is included
in QCS8300 SoC. This controller acts as an interrupt controller, enabling
the detection of interrupts when the GIC is non-operational.

Signed-off-by: Jingyi Wang <quic_jingyw@quicinc.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20240911-qcs8300_binding-v2-1-de8641b3eaa1@quicinc.com


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