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

Change-Id: Id9a1f2b4357a9b385f92b05ce98f0dc9e707847b
diff --git a/.gitreview b/.gitreview
index 9c300e2..cae5fbe 100644
--- a/.gitreview
+++ b/.gitreview
@@ -3,3 +3,4 @@
 port=29418
 project=dhcpl2relay.git
 defaultremote=origin
+defaultbranch=voltha-2.11