ARM: dts: stm32mp157: Add SoC pwr regulator entry

Add SoC power regulator entry for reg11, reg18 and usb33
regulator.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>

arch/arm/dts/stm32mp157.dtsi

@@ -123,6 +123,39 @@
 			};
 		};
 
+		pwr: pwr@50001000 {
+			compatible = "st,stm32mp1-pwr", "st,stm32-pwr", "syscon", "simple-mfd";
+			reg = <0x50001000 0x400>;
+			system-power-controller;
+			interrupts = <GIC_SPI 149 IRQ_TYPE_NONE>;
+			st,sysrcc = <&rcc>;
+			clocks = <&rcc_clk PLL2_R>;
+			clock-names = "phyclk";
+
+			pwr-regulators@c {
+				compatible = "st,stm32mp1,pwr-reg";
+				st,tzcr = <&rcc 0x0 0x1>;
+
+				reg11: reg11 {
+					regulator-name = "reg11";
+					regulator-min-microvolt = <1100000>;
+					regulator-max-microvolt = <1100000>;
+				};
+
+				reg18: reg18 {
+					regulator-name = "reg18";
+					regulator-min-microvolt = <1800000>;
+					regulator-max-microvolt = <1800000>;
+				};
+
+				usb33: usb33 {
+					regulator-name = "usb33";
+					regulator-min-microvolt = <3300000>;
+					regulator-max-microvolt = <3300000>;
+				};
+			};
+		};
+
 		pinctrl: pin-controller {
 			compatible = "st,stm32mp157-pinctrl";
 			#address-cells = <1>;