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

Change-Id: I43e5a0f2fbce4543659d5c86567fd6ff97b33908
diff --git a/.gitreview b/.gitreview
index d765be6..7442dfb 100644
--- a/.gitreview
+++ b/.gitreview
@@ -3,3 +3,4 @@
 port=29418
 project=sadis.git
 defaultremote=origin
+defaultbranch=voltha-2.11