ARM: dts: stm32: fix pinctrl node name warnings (MPU soc)

The recent addition pinctrl.yaml in commit c09acbc4 ("dt-bindings:
pinctrl: use pinctrl.yaml") resulted in some node name warnings.
Fix the node names to the preferred 'pinctrl'.
Signed-off-by: Fabien Dessenne <fabien.dessenne@foss.st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>

arch/arm/boot/dts/stm32mp131.dtsi

@@ -239,7 +239,7 @@ ts_cal2: calib@5e {
 		 * Break node order to solve dependency probe issue between
 		 * pinctrl and exti.
 		 */
-		pinctrl: pin-controller@50002000 {
+		pinctrl: pinctrl@50002000 {
 			#address-cells = <1>;
 			#size-cells = <1>;
 			compatible = "st,stm32mp135-pinctrl";

arch/arm/boot/dts/stm32mp151.dtsi

@@ -1623,7 +1623,7 @@ tamp: tamp@5c00a000 {
 		 * Break node order to solve dependency probe issue between
 		 * pinctrl and exti.
 		 */
-		pinctrl: pin-controller@50002000 {
+		pinctrl: pinctrl@50002000 {
 			#address-cells = <1>;
 			#size-cells = <1>;
 			compatible = "st,stm32mp157-pinctrl";
@@ -1754,7 +1754,7 @@ gpiok: gpio@5000c000 {
 			};
 		};
 
-		pinctrl_z: pin-controller-z@54004000 {
+		pinctrl_z: pinctrl@54004000 {
 			#address-cells = <1>;
 			#size-cells = <1>;
 			compatible = "st,stm32mp157-z-pinctrl";