Add gadget repo.

Change-Id: I302fc1310b8fa9eb70c118885676d1d019c242c5
diff --git a/default.xml b/default.xml
index f26c89a..9e45d36 100644
--- a/default.xml
+++ b/default.xml
@@ -39,6 +39,7 @@
     <project path="tools/img2simg" name="img2simg" />
 
     <project path="packages/aiy-board-audio" name="aiy-board-audio" />
+    <project path="packages/aiy-board-gadget" name="aiy-board-gadget" />
     <project path="packages/aiy-board-keyring" name="aiy-board-keyring" />
     <project path="packages/aiy-board-wlan" name="aiy-board-wlan" />