[nrf fromtree] tests: drivers: spi: Run spi_controller_peripheral on nrf54l15 NS

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

Signed-off-by: Sebastian Głąb <[email protected]>
(cherry picked from commit 399c0a9)

Author: nordic-segl

tests/drivers/spi/spi_controller_peripheral/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"

tests/drivers/spi/spi_controller_peripheral/testcase.yaml

@@ -12,6 +12,7 @@ common:
     - nrf54h20dk/nrf54h20/cpurad
     - nrf54h20dk/nrf54h20/cpuppr
     - nrf54l15dk/nrf54l15/cpuapp
+    - nrf54l15dk/nrf54l15/cpuapp/ns
     - nrf54lm20dk/nrf54lm20a/cpuapp
     - ophelia4ev/nrf54l15/cpuapp
 
@@ -81,6 +82,7 @@ tests:
       - nrf54h20dk/nrf54h20/cpurad
       - nrf54h20dk/nrf54h20/cpuppr
       - nrf54l15dk/nrf54l15/cpuapp
+      - nrf54l15dk/nrf54l15/cpuapp/ns
       - nrf54lm20dk/nrf54lm20a/cpuapp
       - ophelia4ev/nrf54l15/cpuapp
 
@@ -94,6 +96,7 @@ tests:
       - nrf54h20dk/nrf54h20/cpurad
       - nrf54h20dk/nrf54h20/cpuppr
       - nrf54l15dk/nrf54l15/cpuapp
+      - nrf54l15dk/nrf54l15/cpuapp/ns
       - nrf54lm20dk/nrf54lm20a/cpuapp
       - ophelia4ev/nrf54l15/cpuapp