Revert "Disable BL2 test for B-U585I-IOT02A"

This reverts commit ca2137aefde902ef2afedd28f865bf36d4167e33.
diff --git a/build_helper/build_helper_configs.py b/build_helper/build_helper_configs.py
index 105694a..cda4bd5 100755
--- a/build_helper/build_helper_configs.py
+++ b/build_helper/build_helper_configs.py
@@ -787,7 +787,7 @@
                 "cmake_build_type": ["Relwithdebinfo"],
                 "with_bl2":         [True],
                 "profile":          [""],
-                "extra_params":     ["-DTEST_BL2=False"]
+                "extra_params":     [""]
                 },
                 "common_params": _common_tfm_builder_cfg,
                 "invalid": _common_tfm_invalid_configs + []