Add bt and dependency.

Change-Id: I1a468c79f64546ab94d9e77b7151475025875a60
diff --git a/debian/control b/debian/control
index ba03f42..01f5beb 100644
--- a/debian/control
+++ b/debian/control
@@ -9,6 +9,7 @@
 Priority: optional
 Depends: excelsior-nvram,
          excelsior-wlan,
+         excelsior-bluetooth,
          linux-image-4.4.22-mtk,
          mendel-core,
          lk-bootloader,