ARM: dts: stm32: Add DAC support to stm32mp157c

Add support for DAC (Digital to Analog Converter) to STM32MP157C.
STM32MP157C DAC has two output channels.
Signed-off-by: NFabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: NAlexandre Torgue <alexandre.torgue@st.com>

arch/arm/boot/dts/stm32mp157c.dtsi

@@ -343,6 +343,30 @@
 			status = "disabled";
 		};
 
+		dac: dac@40017000 {
+			compatible = "st,stm32h7-dac-core";
+			reg = <0x40017000 0x400>;
+			clocks = <&rcc DAC12>;
+			clock-names = "pclk";
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "disabled";
+
+			dac1: dac@1 {
+				compatible = "st,stm32-dac";
+				#io-channels-cells = <1>;
+				reg = <1>;
+				status = "disabled";
+			};
+
+			dac2: dac@2 {
+				compatible = "st,stm32-dac";
+				#io-channels-cells = <1>;
+				reg = <2>;
+				status = "disabled";
+			};
+		};
+
 		uart7: serial@40018000 {
 			compatible = "st,stm32h7-uart";
 			reg = <0x40018000 0x400>;