update branch name to stable

Change-Id: I69307fdb6e8eaea14f441e7897cb59697a2000af
diff --git a/repo b/repo
index 1ef77b2..2fbf202 100755
--- a/repo
+++ b/repo
@@ -6,7 +6,7 @@
 REPO_URL = os.environ.get('REPO_URL', None)
 if not REPO_URL:
   REPO_URL = 'http://git01.mediatek.com/git-repo'
-REPO_REV = 'master'
+REPO_REV = 'stable'
 
 # Copyright (C) 2008 Google Inc.
 #