dt-bindings: soc: qcom: smd-rpm: Add MSM8909

Document the "qcom,rpm-msm8909" compatible to describe the interface to
the Resource Power Manager (RPM) on the MSM8909 SoC.
Signed-off-by: Stephan Gerhold <stephan.gerhold@kernkonzept.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220705143523.3390944-2-stephan.gerhold@kernkonzept.com

Documentation/devicetree/bindings/soc/qcom/qcom,smd-rpm.yaml

@@ -34,6 +34,7 @@ properties:
       - qcom,rpm-apq8084
       - qcom,rpm-ipq6018
       - qcom,rpm-msm8226
+      - qcom,rpm-msm8909
       - qcom,rpm-msm8916
       - qcom,rpm-msm8936
       - qcom,rpm-msm8953