xtest: 'invoke tests' pTA API from exported include files

Pseudo TA "invoke_tests" now exports its API in the devkit.
Rely on it rather than locally duplicating the API.

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>
diff --git a/host/xtest/xtest_test.h b/host/xtest/xtest_test.h
index 95c8b52..6bc7159 100644
--- a/host/xtest/xtest_test.h
+++ b/host/xtest/xtest_test.h
@@ -121,7 +121,7 @@
 extern const TEEC_UUID storage2_ta_uuid;
 extern const TEEC_UUID enc_fs_key_manager_test_ta_uuid;
 extern const TEEC_UUID ecc_test_ta_uuid;
-extern const TEEC_UUID sta_test_ta_uuid;
+extern const TEEC_UUID pta_invoke_tests_ta_uuid;
 extern const TEEC_UUID gp_tta_time_uuid;
 extern const TEEC_UUID concurrent_ta_uuid;
 extern const TEEC_UUID concurrent_large_ta_uuid;