dt-bindings: arm: qcom: document AL02-C2 board based on IPQ9574 family

Document AL02-C2 (Reference Design Platform 418) board based on IPQ9574
family of SoCs.
Signed-off-by: Devi Priya <quic_devipriy@quicinc.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230510104359.16678-2-quic_devipriy@quicinc.com

Documentation/devicetree/bindings/arm/qcom.yaml

@@ -86,6 +86,7 @@ description: |
   The 'board' element must be one of the following strings:
 
         adp
+        ap-al02-c2
         ap-al02-c7
         ap-mi01.2
         ap-mi01.6
@@ -352,6 +353,7 @@ properties:
 
       - items:
           - enum:
+              - qcom,ipq9574-ap-al02-c2
               - qcom,ipq9574-ap-al02-c7
           - const: qcom,ipq9574