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/scripts/code_size_compare.py b/scripts/code_size_compare.py
index abd13df..eefda31 100755
--- a/scripts/code_size_compare.py
+++ b/scripts/code_size_compare.py
@@ -21,9 +21,9 @@
 import typing
 from enum import Enum
 
-from mbedtls_dev import build_tree
-from mbedtls_dev import logging_util
-from mbedtls_dev import typing_util
+from mbedtls_framework import build_tree
+from mbedtls_framework import logging_util
+from mbedtls_framework import typing_util
 
 class SupportedArch(Enum):
     """Supported architecture for code size measurement."""