dt-bindings: arm: qcom: add missing MSM8992 board compatibles

Document board compatibles already present in Linux kernel.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220521164550.91115-3-krzysztof.kozlowski@linaro.orgSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

Documentation/devicetree/bindings/arm/qcom.yaml

@@ -182,6 +182,13 @@ properties:
           - const: qcom,msm8916-v1-qrd/9-v1
           - const: qcom,msm8916
 
+      - items:
+          - enum:
+              - lg,bullhead
+              - microsoft,talkman
+              - xiaomi,libra
+          - const: qcom,msm8992
+
       - items:
           - enum:
               - sony,karin_windy