Freezing other repos for voltha-2.5

Change-Id: I368e1a42a79a958b900226658038d6ff2d59428a
diff --git a/.gitreview b/.gitreview
index 94a12ba..7a44287 100644
--- a/.gitreview
+++ b/.gitreview
@@ -3,3 +3,4 @@
 port=29418
 project=voltha-docs.git
 defaultremote=origin
+defaultbranch=voltha-2.5