[Bluetooth] Make more functions static

This patch makes another bunch of functions static.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 55dc42e..cf0df1c 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -87,7 +87,7 @@
 	return notifier_chain_unregister(&hci_notifier, nb);
 }
 
-void hci_notify(struct hci_dev *hdev, int event)
+static void hci_notify(struct hci_dev *hdev, int event)
 {
 	notifier_call_chain(&hci_notifier, event, hdev);
 }
@@ -1347,7 +1347,7 @@
 	kfree_skb(skb);
 }
 
-void hci_rx_task(unsigned long arg)
+static void hci_rx_task(unsigned long arg)
 {
 	struct hci_dev *hdev = (struct hci_dev *) arg;
 	struct sk_buff *skb;