riscv: dts: starfive: jh7110: Add syscon nodes

Add stg_syscon/sys_syscon/aon_syscon/PLL nodes for JH7110 SoC.
Reviewed-by: Emil Renner Berthing <emil.renner.berthing@canonical.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Co-developed-by: Xingyu Wu <xingyu.wu@starfivetech.com>
Signed-off-by: Xingyu Wu <xingyu.wu@starfivetech.com>
Signed-off-by: William Qiu <william.qiu@starfivetech.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>

arch/riscv/boot/dts/starfive/jh7110.dtsi

@@ -418,6 +418,11 @@ stgcrg: clock-controller@10230000 {
 			#reset-cells = <1>;
 		};
 
+		stg_syscon: syscon@10240000 {
+			compatible = "starfive,jh7110-stg-syscon", "syscon";
+			reg = <0x0 0x10240000 0x0 0x1000>;
+		};
+
 		uart3: serial@12000000 {
 			compatible = "snps,dw-apb-uart";
 			reg = <0x0 0x12000000 0x0 0x10000>;
@@ -522,6 +527,17 @@ syscrg: clock-controller@13020000 {
 			#reset-cells = <1>;
 		};
 
+		sys_syscon: syscon@13030000 {
+			compatible = "starfive,jh7110-sys-syscon", "syscon", "simple-mfd";
+			reg = <0x0 0x13030000 0x0 0x1000>;
+
+			pllclk: clock-controller {
+				compatible = "starfive,jh7110-pll";
+				clocks = <&osc>;
+				#clock-cells = <1>;
+			};
+		};
+
 		sysgpio: pinctrl@13040000 {
 			compatible = "starfive,jh7110-sys-pinctrl";
 			reg = <0x0 0x13040000 0x0 0x10000>;
@@ -561,6 +577,12 @@ aoncrg: clock-controller@17000000 {
 			#reset-cells = <1>;
 		};
 
+		aon_syscon: syscon@17010000 {
+			compatible = "starfive,jh7110-aon-syscon", "syscon";
+			reg = <0x0 0x17010000 0x0 0x1000>;
+			#power-domain-cells = <1>;
+		};
+
 		aongpio: pinctrl@17020000 {
 			compatible = "starfive,jh7110-aon-pinctrl";
 			reg = <0x0 0x17020000 0x0 0x10000>;