net: bluetooth: compact struct bt_skb_cb by converting boolean fields to bit fields

Convert boolean fields incoming and req_start to bit fields and move
force_active in order save space in bt_skb_cb in an effort to use
a portion of skb->cb[] for storing skb->dropcount.

Signed-off-by: Eyal Birger <eyal.birger@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/bluetooth/hci_request.c b/net/bluetooth/hci_request.c
index db2f45a..f857e76 100644
--- a/net/bluetooth/hci_request.c
+++ b/net/bluetooth/hci_request.c
@@ -116,7 +116,7 @@
 	}
 
 	if (skb_queue_empty(&req->cmd_q))
-		bt_cb(skb)->req_start = true;
+		bt_cb(skb)->req_start = 1;
 
 	bt_cb(skb)->req_event = event;