Revert log level change on HARQ occasion

This reverts a change in commit
ccba7c87. There is no real reason to
show this warning (the gNB will work just fine, simply not schedule
since no free HARQ) and it makes users unsure.

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_uci.c

@@ -1353,7 +1353,7 @@ int nr_acknack_scheduling(gNB_MAC_INST *mac,
       return pucch_index; // index of current PUCCH structure
     }
   }
-  LOG_W(NR_MAC, "DL %4d.%2d, Couldn't find scheduling occasion for this HARQ process\n", frame, slot);
+  LOG_D(NR_MAC, "DL %4d.%2d, Couldn't find scheduling occasion for this HARQ process\n", frame, slot);
   return -1;
 }