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 69190f0..4a9f29b 160000
--- a/tf-psa-crypto
+++ b/tf-psa-crypto
@@ -1 +1 @@
-Subproject commit 69190f0c6ce18cbf73aada630323bffff758c82b
+Subproject commit 4a9f29b05c661bd874c75d80339fcce00adea4e0