Update references to mbedtls_dev

Change these to point to the new mbedtls_framework module in the
framework submodule.

Signed-off-by: David Horstmann <david.horstmann@arm.com>
diff --git a/tests/scripts/check_names.py b/tests/scripts/check_names.py
index 9e8ed21..5128dc8 100755
--- a/tests/scripts/check_names.py
+++ b/tests/scripts/check_names.py
@@ -45,7 +45,7 @@
 import logging
 
 import scripts_path # pylint: disable=unused-import
-from mbedtls_dev import build_tree
+from mbedtls_framework import build_tree
 
 
 # Naming patterns to check against. These are defined outside the NameCheck