static check: ignore the folders without TFM code

The TFM code are in:
    secure_fw/
    interface/

Change-Id: I9aef912f39328d0687ff2a084411c384eb56d98f
Signed-off-by: Karl Zhang <karl.zhang@arm.com>
diff --git a/script/static-checks/check-include-order.py b/script/static-checks/check-include-order.py
index 6a3a5a3..7c32d65 100755
--- a/script/static-checks/check-include-order.py
+++ b/script/static-checks/check-include-order.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 #
-# Copyright (c) 2019-2020, Arm Limited. All rights reserved.
+# Copyright (c) 2019-2021, Arm Limited. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -24,12 +24,11 @@
 # Paths inside the tree to ignore. Hidden folders and files are always ignored.
 # They mustn't end in '/'.
 IGNORED_FOLDERS = (
-    "include/lib/stdlib",
-    "include/lib/libc",
-    "include/lib/libfdt",
-    "lib/libfdt",
-    "lib/libc",
-    "lib/stdlib",
+    'platform/ext',
+    'bl2/ext',
+    'docs',
+    'lib',
+    'tools'
 )
 
 # List of ignored files in folders that aren't ignored
@@ -68,7 +67,8 @@
         commit_hash = commit_hash + ":"
 
     # Get list of system includes from libc include directory.
-    libc_incs = [f for f in os.listdir("include/lib/libc") if f.endswith(".h")]
+    # No libc from TF-M secure_fw
+    libc_incs = []
 
     # First, check if all includes are in the appropriate group.
     inc_group = "System"