qcacmn: Remove unnecessary checks in Tx path

1. Remove prints in per packet path
2. Add prefecth for skb shinfo
3. Avoid qdf_get_cpu() in DP tx

Change-Id: I86d196cc7865a2d5b3a5a6098f6f7d84397a60d0
CRs-Fixed: 3227568

dp/wifi3.0/dp_tx.h

@@ -521,11 +521,7 @@ static inline void dp_tx_get_queue(struct dp_vdev *vdev,
 				DP_TX_QUEUE_MASK;
 
 	queue->desc_pool_id = queue_offset;
-	queue->ring_id = qdf_get_cpu();
-
-	dp_tx_debug("pool_id:%d ring_id: %d",
-		    queue->desc_pool_id, queue->ring_id);
-
+	queue->ring_id = qdf_nbuf_get_queue_mapping(nbuf);
 }
 
 /*