dts: gd32e103: add dac support.

enable dac.


Signed-off-by: YuLong Yao <[email protected]>

Author: feilongfl

dts/arm/gigadevice/gd32e10x/gd32e10x.dtsi

@@ -89,6 +89,16 @@
 			label = "USART_4";
 		};
 
+		dac: dac@40007400 {
+			compatible = "gd,gd32-dac";
+			reg = <0x40007400 0x400>;
+			rcu-periph-clock = <0x71d>;
+			num-channels = <2>;
+			label = "DAC";
+			status = "disabled";
+			#io-channel-cells = <1>;
+		};
+
 		i2c0: i2c@40005400 {
 			compatible = "gd,gd32-i2c";
 			reg = <0x40005400 0x400>;