ARM: dts: lpc32xx: Use syscon for system control block

The clock controller is a part of NXP LPC32xx system control block (SCB),
and SCB provides a number of controllers apart of the clock controller.

[vzapolskiy]:
1. kept a simple comment,
2. renamed SoC specific compatible to 'nxp,lpc3220-scb' due to the SoC UM,
3. changed size in 'ranges', since it should cover more SCB functions,
4. updated the commit message.

Link to the original change:
* https://lore.kernel.org/linux-arm-kernel/20240627150046.258795-5-piotr.wojtaszczyk@timesys.com/

Signed-off-by: Piotr Wojtaszczyk <piotr.wojtaszczyk@timesys.com>
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>

Author: pwojtaszczyk-ts

arch/arm/boot/dts/nxp/lpc/lpc32xx.dtsi

@@ -308,17 +308,17 @@
 			ranges = <0x20000000 0x20000000 0x30000000>;
 
 			/* System Control Block */
-			scb {
-				compatible = "simple-bus";
-				ranges = <0x0 0x40004000 0x00001000>;
+			syscon@40004000 {
+				compatible = "nxp,lpc3220-scb", "syscon", "simple-mfd";
+				reg = <0x40004000 0x1000>;
 				#address-cells = <1>;
 				#size-cells = <1>;
+				ranges = <0 0x40004000 0x1000>;
 
 				clk: clock-controller@0 {
 					compatible = "nxp,lpc3220-clk";
 					reg = <0x00 0x114>;
 					#clock-cells = <1>;
-
 					clocks = <&xtal_32k>, <&xtal>;
 					clock-names = "xtal_32k", "xtal";
 				};