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/generate_psa_constants.py b/scripts/generate_psa_constants.py
index f13b507..119a632 100755
--- a/scripts/generate_psa_constants.py
+++ b/scripts/generate_psa_constants.py
@@ -17,8 +17,8 @@
 import os
 import sys
 
-from mbedtls_dev import build_tree
-from mbedtls_dev import macro_collector
+from mbedtls_framework import build_tree
+from mbedtls_framework import macro_collector
 
 OUTPUT_TEMPLATE = '''\
 /* Automatically generated by generate_psa_constant.py. DO NOT EDIT. */