[nrf fromtree] tests: drivers: sensor: temp_sensor: Run test on nrf54l15 NS

Enable temp_senor test on nrf54l15dk/nrf54l15/cpuapp/ns platform.

Signed-off-by: Sebastian Głąb <[email protected]>
(cherry picked from commit 8a01e8d)

Author: nordic-segl

tests/drivers/sensor/temp_sensor/boards/nrf54l15dk_nrf54l15_cpuapp_ns.overlay

@@ -0,0 +1,7 @@
+/*
+ * Copyright (c) 2025 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "nrf54l15dk_nrf54l15_cpuapp.overlay"