dt-bindings: mailbox: qcom: enable syscon compatible for msm8976

On msm8976 platform APCS also uses syscon compatible, so move it to the
block of compatibles using SoC-compat together with syscon.

Fixes: 60545466 ("dt-bindings: mailbox: qcom,apcs-kpss-global: Add syscon const for relevant entries")
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>

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

@@ -20,7 +20,6 @@ properties:
           - enum:
               - qcom,ipq6018-apcs-apps-global
               - qcom,ipq8074-apcs-apps-global
-              - qcom,msm8976-apcs-kpss-global
               - qcom,msm8996-apcs-hmss-global
               - qcom,msm8998-apcs-hmss-global
               - qcom,qcm2290-apcs-hmss-global
@@ -37,6 +36,7 @@ properties:
               - qcom,msm8916-apcs-kpss-global
               - qcom,msm8939-apcs-kpss-global
               - qcom,msm8953-apcs-kpss-global
+              - qcom,msm8976-apcs-kpss-global
               - qcom,msm8994-apcs-kpss-global
               - qcom,qcs404-apcs-apps-global
               - qcom,sdx55-apcs-gcc