dt-bindings: mailbox: qcom-ipcc: document the X1E80100 Inter-Processor Communication Controller

Document the Inter-Processor Communication Controller on the X1E80100 Platform.
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>

Documentation/devicetree/bindings/mailbox/qcom-ipcc.yaml

@@ -35,6 +35,7 @@ properties:
           - qcom,sm8450-ipcc
           - qcom,sm8550-ipcc
           - qcom,sm8650-ipcc
+          - qcom,x1e80100-ipcc
       - const: qcom,ipcc
 
   reg: