Revert "Disable BL2 for b-u585i-iot02a"

This reverts commit b1a1823c14641d16e2e53045cf36a864bc495a88.
diff --git a/build_helper/build_helper_configs.py b/build_helper/build_helper_configs.py
index 9c0145d..cda4bd5 100755
--- a/build_helper/build_helper_configs.py
+++ b/build_helper/build_helper_configs.py
@@ -785,7 +785,7 @@
                 "test_regression":  ["OFF", "RegS, RegNS"],
                 "test_psa_api":     ["OFF"],
                 "cmake_build_type": ["Relwithdebinfo"],
-                "with_bl2":         [False],
+                "with_bl2":         [True],
                 "profile":          [""],
                 "extra_params":     [""]
                 },