tests: settings: tfm_psa: link app to tfm_api

tfm_api library is the one that provides the interface headers which
are necessary to build the application:
- psa/internal_trusted_storage.h
- psa/protected_storage.h

Signed-off-by: Valerio Setti <vsetti@baylibre.com>

Author: valeriosetti

tests/subsys/settings/functional/tfm_psa/CMakeLists.txt

@@ -8,3 +8,7 @@ project(functional_psa)
 target_sources(app PRIVATE settings_test_psa.c)
 
 add_subdirectory(../src func_test_bindir)
+
+if (CONFIG_BUILD_WITH_TFM)
+  target_link_libraries(app PRIVATE tfm_api)
+endif()