Fix incorrect paths to generate_psa_constants.py

This commit fixes incorrect paths to generate_psa_constants.py after
being moves to tf-psa-crypto.

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
index 4d4a440..fd39ce3 100644
--- a/tf-psa-crypto/scripts/framework_scripts_path.py
+++ b/tf-psa-crypto/scripts/framework_scripts_path.py
@@ -14,4 +14,5 @@
 
 sys.path.append(os.path.join(os.path.dirname(__file__),
                              os.path.pardir,
+                             os.path.pardir,
                              'framework', 'scripts'))