Update submodule pointer

Signed-off-by: Ben Taylor <ben.taylor@linaro.org>
diff --git a/tf-psa-crypto b/tf-psa-crypto
index 5157a28..19edaa7 160000
--- a/tf-psa-crypto
+++ b/tf-psa-crypto
@@ -1 +1 @@
-Subproject commit 5157a286d52c1e5fe825476bec6a2ee3a4a0c4c5
+Subproject commit 19edaa785dd71ec8f0c9f72235243314c3d895fa