Update gitreview for v2.11 release, merge with branch=voltha-2.11 by default

Change-Id: I4c0bb17c9f1d2f70e7df58e5c464a37fb2950656
diff --git a/.gitreview b/.gitreview
index 60d65aa..17bfa85 100644
--- a/.gitreview
+++ b/.gitreview
@@ -3,3 +3,4 @@
 port=29418
 project=pod-configs.git
 defaultremote=origin
+defaultbranch=voltha-2.11