dt-bindings: mailbox: qcom: Add CPUCP mailbox controller bindings for Kaanapali

Document CPUSS Control Processor (CPUCP) mailbox controller for Qualcomm
Kaanapali, which is compatible with X1E80100, use fallback to indicate
this.

Signed-off-by: Jingyi Wang <jingyi.wang@oss.qualcomm.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>

Author: jingyiwang42

Documentation/devicetree/bindings/mailbox/qcom,cpucp-mbox.yaml

@@ -19,6 +19,7 @@ properties:
       - items:
           - enum:
               - qcom,glymur-cpucp-mbox
+              - qcom,kaanapali-cpucp-mbox
           - const: qcom,x1e80100-cpucp-mbox
       - enum:
           - qcom,x1e80100-cpucp-mbox