arm64: dts: ti: k3-*: Rename the TI-SCI node

Lets rename the node name of TI-SCI node to be system-controller as it
is a better standardized name for the function that TI-SCI plays in the
SoC.

Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Tero Kristo <kristo@kernel.org>
Link: https://lore.kernel.org/r/20210510145033.7426-5-nm@ti.com

arch/arm64/boot/dts/ti/k3-am64-main.dtsi

@@ -134,7 +134,7 @@
 		};
 	};
 
-	dmsc: dmsc@44043000 {
+	dmsc: system-controller@44043000 {
 		compatible = "ti,k2g-sci";
 		ti,host-id = <12>;
 		mbox-names = "rx", "tx";

arch/arm64/boot/dts/ti/k3-am65-wakeup.dtsi

@@ -6,7 +6,7 @@
  */
 
 &cbass_wakeup {
-	dmsc: dmsc@44083000 {
+	dmsc: system-controller@44083000 {
 		compatible = "ti,am654-sci";
 		ti,host-id = <12>;
 

arch/arm64/boot/dts/ti/k3-j7200-mcu-wakeup.dtsi

@@ -6,7 +6,7 @@
  */
 
 &cbass_mcu_wakeup {
-	dmsc: dmsc@44083000 {
+	dmsc: system-controller@44083000 {
 		compatible = "ti,k2g-sci";
 		ti,host-id = <12>;
 

arch/arm64/boot/dts/ti/k3-j721e-mcu-wakeup.dtsi

@@ -6,7 +6,7 @@
  */
 
 &cbass_mcu_wakeup {
-	dmsc: dmsc@44083000 {
+	dmsc: system-controller@44083000 {
 		compatible = "ti,k2g-sci";
 		ti,host-id = <12>;