dt-bindings: arm: qcom: document MI01.9 board based on IPQ5332 family

Document the MI01.9 (Reference Design Platform 474) board based on IPQ5332
family of SoCs.
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Kathiravan T <quic_kathirav@quicinc.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230605080531.3879-4-quic_kathirav@quicinc.com

Documentation/devicetree/bindings/arm/qcom.yaml

@@ -94,6 +94,7 @@ description: |
         ap-mi01.2
         ap-mi01.3
         ap-mi01.6
+        ap-mi01.9
         cdp
         cp01-c1
         dragonboard
@@ -341,6 +342,7 @@ properties:
               - qcom,ipq5332-ap-mi01.2
               - qcom,ipq5332-ap-mi01.3
               - qcom,ipq5332-ap-mi01.6
+              - qcom,ipq5332-ap-mi01.9
           - const: qcom,ipq5332
 
       - items: