Add device tree link to tilapia

Change-Id: I00750604886d0f69d066f37f011155666a948e84
diff --git a/_devices/asusnexus720123g.markdown b/_devices/asusnexus720123g.markdown
index 5be672a..2772824 100644
--- a/_devices/asusnexus720123g.markdown
+++ b/_devices/asusnexus720123g.markdown
@@ -7,6 +7,7 @@
 supportstatus: Current

 maintainer: Dees_Troy

 oem: Asus

+devicetree: https://github.com/TeamWin/android_device_asus_tilapia

 xdathread: "http://forum.xda-developers.com/showthread.php?t=1779092"

 ---