Update TF-PSA-Crypto submodule to add iop export public-key get_num_ops()

Signed-off-by: Waleed Elmelegy <waleed.elmelegy@arm.com>
diff --git a/tf-psa-crypto b/tf-psa-crypto
index 26bc88c..9e4ac37 160000
--- a/tf-psa-crypto
+++ b/tf-psa-crypto
@@ -1 +1 @@
-Subproject commit 26bc88ccd708e8f5748b5aa90691980d5bb111c0
+Subproject commit 9e4ac374e2be67892e70b9c653c6872ba8a2031b