twrpme: add gitactivity changelog tag to device markdowns

Change-Id: I437a42c1b2ccd79b3f85ad0962c362680c28d171
diff --git a/_devices/sonyxperiaztablet.markdown b/_devices/sonyxperiaztablet.markdown
index 837aba5..1588af8 100644
--- a/_devices/sonyxperiaztablet.markdown
+++ b/_devices/sonyxperiaztablet.markdown
@@ -6,6 +6,7 @@
 oldurl: http://teamw.in/project/twrp2/185
 supportstatus: Current
 maintainer: Dees_Troy
+devicetree: https://github.com/TeamWin/android_device_sony_pollux_windy.git
 oem: Sony
 xdathread: "http://forum.xda-developers.com/showthread.php?t=2413289"
 ddof: /dev/block/platform/msm_sdcc.1/by-name/FOTAKernel