samples: drivers: counter: Add support alarm for lp_mspm0g3507

Add a support for timer/counter alarm sample for lp_mspmg3507 board.

Signed-off-by: Saravanan Sekar <saravanan@linumiz.com>

samples/drivers/counter/alarm/boards/lp_mspm0g3507.overlay

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2025 Linumiz GmbH
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	aliases {
+		counter = &counter0;
+	};
+};
+
+&gpt0 {
+	status = "okay";
+	counter0: counter {
+		status = "okay";
+	};
+};

samples/drivers/counter/alarm/src/main.c

@@ -39,6 +39,8 @@ struct counter_alarm_cfg alarm_cfg;
 #define TIMER DT_INST(0, espressif_esp32_counter)
 #elif defined(CONFIG_COUNTER_MCUX_CTIMER)
 #define TIMER DT_NODELABEL(ctimer0)
+#elif defined(CONFIG_COUNTER_MSPM0_TIMER)
+#define TIMER DT_ALIAS(counter)
 #elif defined(CONFIG_COUNTER_NXP_S32_SYS_TIMER)
 #define TIMER DT_NODELABEL(stm0)
 #elif defined(CONFIG_COUNTER_TIMER_GD32)