dt-bindings: mailbox: qcom: Document Glymur CPUCP mailbox controller binding

Document CPU Control Processor (CPUCP) mailbox controller for Qualcomm
Glymur SoCs. It is software compatible with X1E80100 CPUCP mailbox
controller hence fallback to it.

Signed-off-by: Sibi Sankar <[e-mail]>
Acked-by: Rob Herring (Arm) <[e-mail]>
Signed-off-by: Jassi Brar <[e-mail]>

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

···
 
 properties:
   compatible:
-    items:
-      - const: qcom,x1e80100-cpucp-mbox
+    oneOf:
+      - items:
+          - enum:
+              - qcom,glymur-cpucp-mbox
+          - const: qcom,x1e80100-cpucp-mbox
+      - enum:
+          - qcom,x1e80100-cpucp-mbox
 
   reg:
     items: