Remove unnecessary test steps

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
diff --git a/tests/suites/test_suite_psa_crypto.function b/tests/suites/test_suite_psa_crypto.function
index cd97c50..5455fc6 100644
--- a/tests/suites/test_suite_psa_crypto.function
+++ b/tests/suites/test_suite_psa_crypto.function
@@ -4172,16 +4172,12 @@
     PSA_ASSERT( psa_import_key( &attributes, key_data->x, key_data->len,
                                 &key ) );
 
-    mbedtls_test_set_step( 0 );
-
     status = psa_aead_encrypt_setup( &operation, key, alg );
 
     TEST_EQUAL( status, expected_status );
 
     psa_aead_abort( &operation );
 
-    mbedtls_test_set_step( 1 );
-
     status = psa_aead_decrypt_setup( &operation, key, alg );
 
     TEST_EQUAL(status, expected_status );