nr: rlc: minor: set log level to error for max retx reached

Just in case there is a problem, better to see it.

max retx reached means "radio link failure". We should do
something about it at some point. For the moment, let's
inform the user that there is a problem.

We can set back to LOG_D later in time when we deal with it
properly.

openair2/LAYER2/nr_rlc/nr_rlc_oai_api.c

@@ -561,7 +561,7 @@ static void max_retx_reached(void *_ue, nr_rlc_entity_t *entity)
   exit(1);
 
 rb_found:
-  LOG_D(RLC, "max RETX reached on %s %d\n",
+  LOG_E(RLC, "max RETX reached on %s %d\n",
         is_srb ? "SRB" : "DRB",
         rb_id);