psa: Fix references to macros in comments

This commit tries to fix the usage of #MACRO_NAME
to reference macros in comments.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/include/psa/crypto_entropy_driver.h b/include/psa/crypto_entropy_driver.h
index 6175044..9b6546e 100644
--- a/include/psa/crypto_entropy_driver.h
+++ b/include/psa/crypto_entropy_driver.h
@@ -47,7 +47,7 @@
  *                                      containing any context information for
  *                                      the implementation
  *
- * \retval PSA_SUCCESS
+ * \retval #PSA_SUCCESS
  */
 typedef psa_status_t (*psa_drv_entropy_init_t)(void *p_context);
 
@@ -75,7 +75,7 @@
  * \param[out] p_received_entropy_bits      The amount of entropy (in bits)
  *                                          actually provided in `p_buffer`
  *
- * \retval PSA_SUCCESS
+ * \retval #PSA_SUCCESS
  */
 typedef psa_status_t (*psa_drv_entropy_get_bits_t)(void *p_context,
                                                    uint8_t *p_buffer,