test_suite_psa_crypto_driver_wrappers: add counter for cipher_update()

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/tests/src/drivers/test_driver_cipher.c b/tests/src/drivers/test_driver_cipher.c
index 324590c..76ccdcf 100644
--- a/tests/src/drivers/test_driver_cipher.c
+++ b/tests/src/drivers/test_driver_cipher.c
@@ -234,6 +234,7 @@
     size_t *output_length)
 {
     mbedtls_test_driver_cipher_hooks.hits++;
+    mbedtls_test_driver_cipher_hooks.cipher_update_hits++;
 
     if (mbedtls_test_driver_cipher_hooks.forced_output != NULL) {
         if (output_size < mbedtls_test_driver_cipher_hooks.forced_output_length) {