ARM: dts: aspeed: Add reg hints to syscon children

Fixes the following warnings:

    arch/arm/boot/dts/aspeed-g5.dtsi:209.28-226.6: Warning (avoid_unnecessary_addr_size): /ahb/apb/syscon@1e6e2000: unnecessary #address-cells/#size-cells without "ranges" or child "reg" property
    arch/arm/boot/dts/aspeed-g4.dtsi:156.28-172.6: Warning (avoid_unnecessary_addr_size): /ahb/apb/syscon@1e6e2000: unnecessary #address-cells/#size-cells without "ranges" or child "reg" property
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Joel Stanley <joel@jms.id.au>

arch/arm/boot/dts/aspeed-g4.dtsi

@@ -179,18 +179,21 @@ syscon: syscon@1e6e2000 {
 				compatible = "aspeed,ast2400-scu", "syscon", "simple-mfd";
 				reg = <0x1e6e2000 0x1a8>;
 				#address-cells = <1>;
-				#size-cells = <0>;
+				#size-cells = <1>;
+				ranges = <0 0x1e6e2000 0x1000>;
 				#clock-cells = <1>;
 				#reset-cells = <1>;
 
-				pinctrl: pinctrl {
-					compatible = "aspeed,ast2400-pinctrl";
-				};
-
-				p2a: p2a-control {
+				p2a: p2a-control@2c {
+					reg = <0x2c 0x4>;
 					compatible = "aspeed,ast2400-p2a-ctrl";
 					status = "disabled";
 				};
+
+				pinctrl: pinctrl@80 {
+					reg = <0x80 0x18>, <0xa0 0x10>;
+					compatible = "aspeed,ast2400-pinctrl";
+				};
 			};
 
 			rng: hwrng@1e6e2078 {

arch/arm/boot/dts/aspeed-g5.dtsi

@@ -217,20 +217,22 @@ syscon: syscon@1e6e2000 {
 				compatible = "aspeed,ast2500-scu", "syscon", "simple-mfd";
 				reg = <0x1e6e2000 0x1a8>;
 				#address-cells = <1>;
-				#size-cells = <0>;
+				#size-cells = <1>;
+				ranges = <0 0x1e6e2000 0x1000>;
 				#clock-cells = <1>;
 				#reset-cells = <1>;
 
-				pinctrl: pinctrl {
-					compatible = "aspeed,ast2500-pinctrl";
-					aspeed,external-nodes = <&gfx &lhc>;
-
-				};
-
-				p2a: p2a-control {
+				p2a: p2a-control@2c {
 					compatible = "aspeed,ast2500-p2a-ctrl";
+					reg = <0x2c 0x4>;
 					status = "disabled";
 				};
+
+				pinctrl: pinctrl@80 {
+					compatible = "aspeed,ast2500-pinctrl";
+					reg = <0x80 0x18>, <0xa0 0x10>;
+					aspeed,external-nodes = <&gfx>, <&lhc>;
+				};
 			};
 
 			rng: hwrng@1e6e2078 {