Bluetooth: Make hci_le_create_conn() sync

Enables in sync call get feedback from controller about status command
that HCI create LE link command transaction reach the controller stack.  
 
Change-Id: I9755f6911971a5d82898bb0e13a50060a30fd86b
Signed-off-by: Arkadiusz Lichwa <arkadiusz.lichwa@tieto.com>
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 15a73aa..667b158 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -1412,7 +1412,7 @@
 	cp->scan_window = sys_cpu_to_le16(0x0030);
 	cp->supervision_timeout = sys_cpu_to_le16(0x07D0);
 
-	return bt_hci_cmd_send(BT_HCI_OP_LE_CREATE_CONN, buf);
+	return bt_hci_cmd_send_sync(BT_HCI_OP_LE_CREATE_CONN, buf, NULL);
 }
 
 int bt_connect_le(const bt_addr_le_t *peer)