dt-bindings: mailbox: qcom,apcs-kpss-global: drop mbox-names from example

Qualcomm G-Link RPM edge bindings do not allow and do not use mbox-names
property.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230208101545.45711-4-krzysztof.kozlowski@linaro.org

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

@@ -155,7 +155,6 @@ examples:
         interrupts = <GIC_SPI 168 IRQ_TYPE_EDGE_RISING>;
         qcom,rpm-msg-ram = <&rpm_msg_ram>;
         mboxes = <&apcs_glb 0>;
-        mbox-names = "rpm_hlos";
     };
 
   # Example apcs with qcs404