tf-psa-crypto: update reference

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/tf-psa-crypto b/tf-psa-crypto
index 1bc29c9..df85eda 160000
--- a/tf-psa-crypto
+++ b/tf-psa-crypto
@@ -1 +1 @@
-Subproject commit 1bc29c97c99ad40aa9f17b5a873b391454c9c068
+Subproject commit df85eda50d5cd7dbbd06843eaf4ca2c5ee27a874