ARM: dts: qcom: msm8974: Use mboxes in smsm node

With the smsm bindings and driver finally supporting mboxes, switch to
that and stop using apcs as syscon.

Signed-off-by: Luca Weiss <[email protected]>
Reviewed-by: Dmitry Baryshkov <[email protected]>
Reviewed-by: Konrad Dybcio <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Bjorn Andersson <[email protected]>

Author: z3ntu

arch/arm/boot/dts/qcom/qcom-msm8974.dtsi

@@ -294,9 +294,7 @@
 		#address-cells = <1>;
 		#size-cells = <0>;
 
-		qcom,ipc-1 = <&apcs 8 13>;
-		qcom,ipc-2 = <&apcs 8 9>;
-		qcom,ipc-3 = <&apcs 8 19>;
+		mboxes = <0>, <&apcs 13>, <&apcs 9>, <&apcs 19>;
 
 		apps_smsm: apps@0 {
 			reg = <0>;