samples: usb-c: sink: Add support for WeAct STM32G431 core

Add support for the WeAct Studio STM32G431 Core board. Note that this
board does not support USB-C PD in its default configuration. See the
board documentation for the necessary hardware reconfiguration.

Signed-off-by: Andreas Sandberg <andreas@sandberg.uk>

samples/subsys/usb_c/sink/boards/weact_stm32g431_core.overlay

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2023 Andreas Sandberg
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ */
+
+#include <dt-bindings/usb-c/pd.h>
+
+&adc2 {
+	status = "okay";
+};
+
+&vbus1 {
+	status = "okay";
+};
+
+&usbc1 {
+	status = "okay";
+};
+
+&ucpd1 {
+	status = "okay";
+	dead-battery;
+};