Move generate_psa_constants.py to tf-psa-crypto

This commit moves generate_psa_constants.py to tf-psa-crypto and updates
the paths inside the script necessary for that move.

Signed-off-by: Harry Ramsey <harry.ramsey@arm.com>
diff --git a/tf-psa-crypto/scripts/framework_scripts_path.py b/tf-psa-crypto/scripts/framework_scripts_path.py
new file mode 100644
index 0000000..4d4a440
--- /dev/null
+++ b/tf-psa-crypto/scripts/framework_scripts_path.py
@@ -0,0 +1,17 @@
+"""Add our Python library directory to the module search path.
+
+Usage:
+
+    import framework_scripts_path # pylint: disable=unused-import
+"""
+
+# Copyright The Mbed TLS Contributors
+# SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+#
+
+import os
+import sys
+
+sys.path.append(os.path.join(os.path.dirname(__file__),
+                             os.path.pardir,
+                             'framework', 'scripts'))