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/generate_test_keys.py b/tests/scripts/generate_test_keys.py
index 62b7560..9946c24 100755
--- a/tests/scripts/generate_test_keys.py
+++ b/tests/scripts/generate_test_keys.py
@@ -10,8 +10,8 @@
 import re
 import argparse
 import scripts_path # pylint: disable=unused-import
-from mbedtls_dev.asymmetric_key_data import ASYMMETRIC_KEY_DATA
-from mbedtls_dev.build_tree import guess_project_root
+from mbedtls_framework.asymmetric_key_data import ASYMMETRIC_KEY_DATA
+from mbedtls_framework.build_tree import guess_project_root
 
 BYTES_PER_LINE = 16