Edit Xperia M page a bit

Added links to the device tree and to XDA thread

Change-Id: I907e3b5180593178e93ef822a9fe6a2183b4ba8b
diff --git a/_devices/sonyxperiam.markdown b/_devices/sonyxperiam.markdown
index a9251a3..830809c 100644
--- a/_devices/sonyxperiam.markdown
+++ b/_devices/sonyxperiam.markdown
@@ -6,6 +6,8 @@
 supportstatus: Current

 maintainer: cucumber09

 oem: Sony

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

+xdathread: http://forum.xda-developers.com/showthread.php?t=3147051

 ddof: /dev/block/platform/msm_sdcc.1/by-name/FOTAKernel

 ---