Bluetooth: Introduce hci_dev_set_flag helper macro

Instead of manually coding set_bit on hdev->dev_flags all the time,
use hci_dev_set_flag helper macro.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index 5444e19..c0fd42c 100644
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -842,7 +842,7 @@
 	 */
 	if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
 		hci_req_add_le_scan_disable(&req);
-		set_bit(HCI_LE_SCAN_INTERRUPTED, &hdev->dev_flags);
+		hci_dev_set_flag(hdev, HCI_LE_SCAN_INTERRUPTED);
 	}
 
 	hci_req_add_le_create_conn(&req, conn);