ARM: dts: stm32: update pinctrl node name on STM32 MCU to prevent warnings

Update node name to avoid a DT schema validation issue seen with
"make dtbs_check W=1". It also cleans picntrl dtsi files for f429/f469 MCU.
Signed-off-by: NAlexandre Torgue <alexandre.torgue@foss.st.com>

arch/arm/boot/dts/stm32f4-pinctrl.dtsi

@@ -45,7 +45,7 @@
 
 / {
 	soc {
-		pinctrl: pin-controller {
+		pinctrl: pin-controller@40020000 {
 			#address-cells = <1>;
 			#size-cells = <1>;
 			ranges = <0 0x40020000 0x3000>;

arch/arm/boot/dts/stm32f429-pinctrl.dtsi

@@ -42,9 +42,7 @@
 
 #include "stm32f4-pinctrl.dtsi"
 
-/ {
-	soc {
-		pinctrl: pin-controller {
+&pinctrl {
 	compatible = "st,stm32f429-pinctrl";
 
 	gpioa: gpio@40020000 {
@@ -90,6 +88,4 @@
 	gpiok: gpio@40022800 {
 		gpio-ranges = <&pinctrl 0 160 8>;
 	};
-		};
-	};
 };

arch/arm/boot/dts/stm32f469-pinctrl.dtsi

@@ -42,9 +42,7 @@
 
 #include "stm32f4-pinctrl.dtsi"
 
-/ {
-	soc {
-		pinctrl: pin-controller {
+&pinctrl {
 	compatible = "st,stm32f469-pinctrl";
 
 	gpioa: gpio@40020000 {
@@ -91,6 +89,4 @@
 	gpiok: gpio@40022800 {
 		gpio-ranges = <&pinctrl 3 163 5>;
 	};
-		};
-	};
 };

arch/arm/boot/dts/stm32f7-pinctrl.dtsi

@@ -9,7 +9,7 @@
 
 / {
 	soc {
-		pinctrl: pin-controller {
+		pinctrl: pin-controller@40020000 {
 			#address-cells = <1>;
 			#size-cells = <1>;
 			ranges = <0 0x40020000 0x3000>;