Remove dependency on mbedtls_test_helpers

Remove dependency on mbedtls_test_helpers
to build the crypto test suites.
mbedtls_test_helpers is TLS specific.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/tf-psa-crypto/tests/CMakeLists.txt b/tf-psa-crypto/tests/CMakeLists.txt
index 6224e5f..e7800c9 100644
--- a/tf-psa-crypto/tests/CMakeLists.txt
+++ b/tf-psa-crypto/tests/CMakeLists.txt
@@ -300,8 +300,7 @@
     )
 
     add_executable(test_suite_${data_name} test_suite_${data_name}.c
-                   $<TARGET_OBJECTS:mbedtls_test>
-                   $<TARGET_OBJECTS:mbedtls_test_helpers>)
+                   $<TARGET_OBJECTS:mbedtls_test>)
     add_dependencies(test_suite_${data_name} ${dependency})
     target_link_libraries(test_suite_${data_name} ${libs})
     # Include test-specific header files from ./include and private header