Add vendor/opensource/backports-quantenna.

Change-Id: I2ffd72efd7a303cb3585225d074e6fbc597b0fcb
diff --git a/default.xml b/default.xml
index 660156a..98d4bc4 100644
--- a/default.xml
+++ b/default.xml
@@ -131,6 +131,7 @@
   <project name="vendor/netflix/nrd"/>
   <project name="vendor/ookla"/>
   <project name="vendor/opensource/backports"/>
+  <project name="vendor/opensource/backports" path="vendor/opensource/backports-quantenna" revision="refs/heads/quantenna"/>
   <project name="vendor/opensource/bluez"/>
   <project name="vendor/opensource/dial"/>
   <project name="vendor/opensource/dnsmasq"/>