samples: tfm: Add nRF54L15 in TF-M samples yaml

Add nRF54L15 non secure target for the config_build and
the tfm_ipc samples.

Signed-off-by: Georgios Vasilakis <georgios.vasilakis@nordicsemi.no>

samples/tfm_integration/config_build/sample.yaml

@@ -8,6 +8,7 @@ common:
     - v2m_musca_s1/musca_s1/ns
     - nrf5340dk/nrf5340/cpuapp/ns
     - nrf9160dk/nrf9160/ns
+    - nrf54l15dk/nrf54l15/cpuapp/ns
     - bl5340_dvk/nrf5340/cpuapp/ns
   integration_platforms:
     - nrf5340dk/nrf5340/cpuapp/ns

samples/tfm_integration/tfm_ipc/sample.yaml

@@ -31,7 +31,9 @@ tests:
     tags:
       - introduction
       - trusted-firmware-m
-    platform_allow: mps2/an521/cpu0/ns
+    platform_allow:
+      - mps2/an521/cpu0/ns
+      - nrf54l15dk/nrf54l15/cpuapp/ns
     extra_configs:
       - CONFIG_TFM_BL2=n
     harness: console