ARM: dts: stm32: use internal regulators bindings for MP15 scmi variants

Use the SCMI voltage domain bindings for internal regulators on stm32mp15.

Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
Link: https://lore.kernel.org/r/20250603-stm32mp157f-dk2-v2-4-5be0854a9299@foss.st.com
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>

Author: ADESTM

arch/arm/boot/dts/st/stm32mp15-scmi.dtsi

@@ -4,6 +4,8 @@
  * Author: Alexandre Torgue <alexandre.torgue@foss.st.com> for STMicroelectronics.
  */
 
+#include <dt-bindings/regulator/st,stm32mp15-regulator.h>
+
 / {
 	firmware {
 		optee: optee {
@@ -35,21 +37,21 @@
 					#size-cells = <0>;
 
 					scmi_reg11: regulator@0 {
-						reg = <0>;
+						reg = <VOLTD_SCMI_REG11>;
 						regulator-name = "reg11";
 						regulator-min-microvolt = <1100000>;
 						regulator-max-microvolt = <1100000>;
 					};
 
 					scmi_reg18: regulator@1 {
-						reg = <1>;
+						reg = <VOLTD_SCMI_REG18>;
 						regulator-name = "reg18";
 						regulator-min-microvolt = <1800000>;
 						regulator-max-microvolt = <1800000>;
 					};
 
 					scmi_usb33: regulator@2 {
-						reg = <2>;
+						reg = <VOLTD_SCMI_USB33>;
 						regulator-name = "usb33";
 						regulator-min-microvolt = <3300000>;
 						regulator-max-microvolt = <3300000>;