Downgrading log message to DEBUG for better RT

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

targets/RT/USER/lte-ru.c

@@ -1554,7 +1554,7 @@ static void* ru_thread_tx( void* param ) {
     if (oai_exit) break;   
 
 
-	LOG_I(PHY,"ru_thread_tx: Waiting for TX processing\n");
+    LOG_D(PHY,"ru_thread_tx: Waiting for TX processing\n");
     // wait until eNBs are finished subframe RX n and TX n+4
     wait_on_condition(&proc->mutex_eNBs,&proc->cond_eNBs,&proc->instance_cnt_eNBs,"ru_thread_tx");
     if (oai_exit) break;