dt-bindings: mailbox: qcom,apcs-kpss-global: fix SDX55 'if' match

The qcom,sdx55-apcs-gcc is followed by another compatible (syscon), thus
the 'if' clause must match by contains.

Fixes: 0d17014 ("dt-bindings: mailbox: Add binding for SDX55 APCS")
Signed-off-by: Krzysztof Kozlowski <[email protected]>
Acked-by: Rob Herring <[email protected]>
Acked-by: Manivannan Sadhasivam <[email protected]>
Signed-off-by: Bjorn Andersson <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: krzk

Documentation/devicetree/bindings/mailbox/qcom,apcs-kpss-global.yaml

@@ -91,8 +91,9 @@ allOf:
   - if:
       properties:
         compatible:
-          enum:
-            - qcom,sdx55-apcs-gcc
+          contains:
+            enum:
+              - qcom,sdx55-apcs-gcc
     then:
       properties:
         clocks: