arm64: dts: qcom: sc7180: add compatible fallback to mailbox

SC7180 mailbox is compatible with SDM845.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230322174148.810938-11-krzysztof.kozlowski@linaro.org

arch/arm64/boot/dts/qcom/sc7180.dtsi

@@ -3418,7 +3418,8 @@ msi-controller@17a40000 {
 		};
 
 		apss_shared: mailbox@17c00000 {
-			compatible = "qcom,sc7180-apss-shared";
+			compatible = "qcom,sc7180-apss-shared",
+				     "qcom,sdm845-apss-shared";
 			reg = <0 0x17c00000 0 0x10000>;
 			#mbox-cells = <1>;
 		};