samples: drivers: Add watchdog sample support for MSPM0 boards

Add board-specific overlays to enable the MSPM0 WWDT in the Zephyr
watchdog sample for lp_mspm0g3507 and lp_mspm0l2228 boards.

Signed-off-by: Jackson Farley <[email protected]>
Signed-off-by: Sanjay Vallimanalan <[email protected]>

Author: SanjayyyV

samples/drivers/watchdog/boards/lp_mspm0g3507.overlay

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2024 Texas Instruments
+ * Copyright (c) 2025 Linumiz GmbH
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	aliases {
+		watchdog0 = &wdt0;
+	};
+};
+
+&wdt0 {
+	status = "okay";
+};

samples/drivers/watchdog/boards/lp_mspm0l2228.overlay

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2024 Texas Instruments
+ * Copyright (c) 2025 Linumiz GmbH
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	aliases {
+		watchdog0 = &wdt0;
+	};
+};
+
+&wdt0 {
+	status = "okay";
+};