net: use SKB_CONSUMED in skb_attempt_defer_free()

skb_attempt_defer_free() is used to free already processed skbs, so pass
SKB_CONSUMED as the reason in kfree_skb_napi_cache().
Suggested-by: Jason Xing <kerneljasonxing@gmail.com>
Suggested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/bcf5dbdda79688b074ab7ae2238535840a6d3fc2.1712711977.git.asml.silence@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

net/core/skbuff.c

@@ -6983,7 +6983,7 @@ static void kfree_skb_napi_cache(struct sk_buff *skb)
 	}
 
 	local_bh_disable();
-	__napi_kfree_skb(skb, SKB_DROP_REASON_NOT_SPECIFIED);
+	__napi_kfree_skb(skb, SKB_CONSUMED);
 	local_bh_enable();
 }