Make it possible to pass arguments to PSA sim psa_client

Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
diff --git a/tests/psa-client-server/psasim/test/run_test.sh b/tests/psa-client-server/psasim/test/run_test.sh
index 31429c8..45a317a 100755
--- a/tests/psa-client-server/psasim/test/run_test.sh
+++ b/tests/psa-client-server/psasim/test/run_test.sh
@@ -33,5 +33,5 @@
 ./psa_partition -k &
 SERV_PID=$!
 wait_for_server_startup
-./psa_client
+./psa_client "$@"
 wait $SERV_PID