UNDO: Add SNRT_ENABLE_NARROW_REDUCTION flag

Author: colluca

sw/runtime/src/sync.h

@@ -188,7 +188,7 @@ inline void snrt_cluster_hw_barrier() {
  *       stall indefinitely.
  */
 static inline void snrt_inter_cluster_barrier(snrt_comm_t comm = NULL) {
-#ifdef SNRT_SUPPORTS_NARROW_REDUCTION
+#if defined(SNRT_SUPPORTS_NARROW_REDUCTION) && defined(SNRT_ENABLE_NARROW_REDUCTION)
     // Fetch the address for the reduction
     uint32_t *addr = (uint32_t *)snrt_remote_l1_ptr(&(snrt_cls()->reduction),
                                                     snrt_cluster_idx(), 0);