dt-bindings: mailbox: qcom,apcs-kpss-global: drop duplicated qcom,ipq8074-apcs-apps-global

qcom,ipq8074-apcs-apps-global compatible is listed in two places: with
and without fallback.  Drop the second case to match DTS.

Fixes: 34d8775a ("dt-bindings: mailbox: qcom,apcs-kpss-global: use fallbacks for few variants")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>

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

@@ -41,7 +41,6 @@ properties:
           - const: syscon
       - enum:
           - qcom,ipq6018-apcs-apps-global
-          - qcom,ipq8074-apcs-apps-global
           - qcom,msm8996-apcs-hmss-global
           - qcom,msm8998-apcs-hmss-global
           - qcom,qcm2290-apcs-hmss-global