Bluetooth: hci_serdev: allow modular drivers

For bluetooth protocol driver only supporting serdev it makes
sense to follow common practice and built them into their own
module.

Such modules need access to hci_uart_register_device and
hci_uart_tx_wakeup for using the common protocol helpers.

Signed-off-by: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index 0ec8a94..17bcbc1 100644
--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -134,6 +134,7 @@
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(hci_uart_tx_wakeup);
 
 static void hci_uart_write_work(struct work_struct *work)
 {
diff --git a/drivers/bluetooth/hci_serdev.c b/drivers/bluetooth/hci_serdev.c
index 3b8ac0e..7de0edc 100644
--- a/drivers/bluetooth/hci_serdev.c
+++ b/drivers/bluetooth/hci_serdev.c
@@ -353,3 +353,4 @@
 	p->close(hu);
 	return err;
 }
+EXPORT_SYMBOL_GPL(hci_uart_register_device);