Invalid Isolation Level3 for ProfileM

Change-Id: Ib139bc9a23f2da6d20f0754c2d0175bae094bd59
Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
diff --git a/build_helper/build_helper_configs.py b/build_helper/build_helper_configs.py
index 8fd3ee2..ad0cccf 100755
--- a/build_helper/build_helper_configs.py
+++ b/build_helper/build_helper_configs.py
@@ -173,6 +173,7 @@
     ("*", "*", False, "*", "*", "*", "*", "*", "*", "*", "profile_medium", "*"),
     # Profile M only support for Isolation Level 2
     ("*", "*", "*", "1", "*", "*", "*",  "*", "*", "*", "profile_medium", "*"),
+    ("*", "*", "*", "3", "*", "*", "*",  "*", "*", "*", "profile_medium", "*"),
     # Profile S does not support MUSCA_B1
     ("musca_b1", "*", "*", "*", "*", "*", "*",  "*", "*", "*", "profile_small", "*"),
     # Profile S does not support PSA_API