samples: die temperature polling: Enable sample for frdm_mcxc242

Die temperature polling sample is not enabled for frdm_mcxc242 board.
Add devicetree overlay and Kconfig configuration for the sample to
enable it.

Signed-off-by: Michal Smola <[email protected]>

Author: michal-smola

samples/sensor/die_temp_polling/boards/frdm_mcxc242.conf

@@ -0,0 +1 @@
+CONFIG_ADC_MCUX_ADC16_VREF_ALTERNATE=y

samples/sensor/die_temp_polling/boards/frdm_mcxc242.overlay

@@ -0,0 +1,15 @@
+/*
+ * Copyright 2024 NXP
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	aliases {
+		die-temp0 = &temp0;
+	};
+};
+
+&temp0 {
+	status = "okay";
+};