feat: Revert ADC changes and set channel 12 for VREFINT

software/apps/adc_dt/boards/weact_stm32g431_core.overlay

@@ -0,0 +1,34 @@
+/{
+    zephyr,user {
+        io-channels = <&adc1 1>, <&adc1 12>;
+    };
+};
+
+&adc1 {
+    status = "okay";
+
+    pinctrl-0 = <&adc1_in1_pa0>;
+    pinctrl-names = "default";
+
+    st,adc-clock-source = "SYNC";
+    st,adc-prescaler = <4>;
+
+    #address-cells = <1>;
+    #size-cells = <0>;
+
+    channel@1 {
+        reg = <1>;
+        zephyr,gain = "ADC_GAIN_1";
+        zephyr,reference = "ADC_REF_INTERNAL";
+        zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+        zephyr,resolution = <12>;
+    };
+
+    channel@c {
+        reg = <0xc>;
+        zephyr,gain = "ADC_GAIN_1";
+        zephyr,reference = "ADC_REF_INTERNAL";
+        zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+        zephyr,resolution = <12>;
+    };
+};