arm64: dts: qcom: msm8953: Use mboxes properties for APCS

Instead of passing the syscon to the various nodes, use the mbox
interface using the mboxes property.
Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20240424-apcs-mboxes-v1-5-6556c47cb501@z3ntu.xyzSigned-off-by: Bjorn Andersson <andersson@kernel.org>

arch/arm64/boot/dts/qcom/msm8953.dtsi

@@ -195,7 +195,7 @@ rpm: remoteproc {
 
 		smd-edge {
 			interrupts = <GIC_SPI 168 IRQ_TYPE_EDGE_RISING>;
-			qcom,ipc = <&apcs 8 0>;
+			mboxes = <&apcs 0>;
 			qcom,smd-edge = <15>;
 
 			rpm_requests: rpm-requests {
@@ -361,7 +361,7 @@ smp2p-modem {
 
 		interrupts = <GIC_SPI 27 IRQ_TYPE_EDGE_RISING>;
 
-		qcom,ipc = <&apcs 8 14>;
+		mboxes = <&apcs 14>;
 
 		qcom,local-pid = <0>;
 		qcom,remote-pid = <1>;
@@ -386,7 +386,7 @@ smp2p-wcnss {
 
 		interrupts = <GIC_SPI 143 IRQ_TYPE_EDGE_RISING>;
 
-		qcom,ipc = <&apcs 8 18>;
+		mboxes = <&apcs 18>;
 
 		qcom,local-pid = <0>;
 		qcom,remote-pid = <4>;
@@ -1267,7 +1267,7 @@ smd-edge {
 				interrupts = <GIC_SPI 25 IRQ_TYPE_EDGE_RISING>;
 
 				qcom,smd-edge = <0>;
-				qcom,ipc = <&apcs 8 12>;
+				mboxes = <&apcs 12>;
 				qcom,remote-pid = <1>;
 
 				label = "modem";
@@ -1748,7 +1748,7 @@ wcnss_iris: iris {
 			smd-edge {
 				interrupts = <GIC_SPI 142 IRQ_TYPE_EDGE_RISING>;
 
-				qcom,ipc = <&apcs 8 17>;
+				mboxes = <&apcs 17>;
 				qcom,smd-edge = <6>;
 				qcom,remote-pid = <4>;