default: Use shipping branch as default

Change-Id: I09ac2c83cd49c5beeffa6665cfe5ae3a8e3b57f8

default.xml

@@ -12,7 +12,7 @@
   <remote  name="private"
            fetch="ssh://git@github.com" />
 
-  <default revision="refs/heads/stable/cm-11.0"
+  <default revision="refs/heads/shipping/cm-11.0"
            remote="github"
            sync-c="true"
            sync-j="4" />