arm64: dts: qcom: sc8180x: align APSS with bindings

SC8180x APSS Devicetree bindings expect qcom,sc8180x-apss-shared to use
qcom,sdm845-apss-shared fallback:

  sc8180x-lenovo-flex-5g.dtb: mailbox@17c00000: compatible: 'oneOf' conditional failed, one must be fixed:
    ['qcom,sc8180x-apss-shared'] is too short
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20231111204725.35707-1-krzysztof.kozlowski@linaro.orgSigned-off-by: Bjorn Andersson <andersson@kernel.org>

arch/arm64/boot/dts/qcom/sc8180x.dtsi

@@ -3415,7 +3415,7 @@ intc: interrupt-controller@17a00000 {
 		};
 
 		apss_shared: mailbox@17c00000 {
-			compatible = "qcom,sc8180x-apss-shared";
+			compatible = "qcom,sc8180x-apss-shared", "qcom,sdm845-apss-shared";
 			reg = <0x0 0x17c00000 0x0 0x1000>;
 			#mbox-cells = <1>;
 		};