boards: degu_evk: use regulator for Vin1 monitoring circuit

Replace custom init code with the regulator infrastructure to enable the
Vin1 monitoring circuit.

Signed-off-by: Gerard Marull-Paretas <[email protected]>

Author: gmarull

boards/arm/degu_evk/CMakeLists.txt

@@ -64,6 +64,14 @@
 		regulator-boot-on;
 	};
 
+	en-vin1-moni {
+		compatible = "regulator-fixed-sync", "regulator-fixed";
+		label = "en_vin1_moni";
+		regulator-name = "en_vin1_moni";
+		enable-gpios = <&gpio1 6 GPIO_ACTIVE_HIGH>;
+		regulator-boot-on;
+	};
+
 	/* These aliases are provided for compatibility with samples */
 	aliases {
 		led0 = &led0;

boards/arm/degu_evk/board.c

@@ -19,7 +19,7 @@ CONFIG_USB_DEVICE_STACK=y
 CONFIG_GPIO=y
 CONFIG_GPIO_AS_PINRESET=y
 
-# required to enable 3V3 power rail
+# required to enable 3V3 power rail and Vin1 monitor
 CONFIG_REGULATOR=y
 
 CONFIG_PINCTRL=y