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

We currently use clocks as the node name for the node representing
TI-SCI clock nodes. This is better renamed to being clock-controller
as that is a better representative of the system controller function
as a clock controller for the SoC.

Signed-off-by: Nishanth Menon <[e-mail]>
Reviewed-by: Tero Kristo <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

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

···
 			#power-domain-cells = <2>;
 		};
 
-		k3_clks: clocks {
+		k3_clks: clock-controller {
 			compatible = "ti,k2g-sci-clk";
 			#clock-cells = <2>;
 		};

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

···
 			#power-domain-cells = <2>;
 		};
 
-		k3_clks: clocks {
+		k3_clks: clock-controller {
 			compatible = "ti,k2g-sci-clk";
 			#clock-cells = <2>;
 		};

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

···
 			#power-domain-cells = <2>;
 		};
 
-		k3_clks: clocks {
+		k3_clks: clock-controller {
 			compatible = "ti,k2g-sci-clk";
 			#clock-cells = <2>;
 		};

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

···
 			#power-domain-cells = <2>;
 		};
 
-		k3_clks: clocks {
+		k3_clks: clock-controller {
 			compatible = "ti,k2g-sci-clk";
 			#clock-cells = <2>;
 		};