Revert "Enable superproject."

Superproject can not yet be enabled as there are nest projects.

This reverts commit fcf24afe8ffb83ac12acf12939289195df77e32c.
diff --git a/default.xml b/default.xml
index 3fa3ac8..4847d19 100644
--- a/default.xml
+++ b/default.xml
@@ -3,9 +3,6 @@
   <default revision="android-msm-crosshatch-4.9-android11-qpr3"
     remote="aosp" sync-j="4" />
 
-  <superproject name="kernel/superproject" remote="aosp"/>
-  <contactinfo bugurl="go/repo-bug" />
-
   <project path="build" name="kernel/build" revision="master"/>
   <project path="private/msm-google" name="kernel/msm" >
     <linkfile src="build.config.bluecross_no-cfi" dest="build.config" />
@@ -19,3 +16,4 @@
   <project path="prebuilts-master/clang/host/linux-x86" name="platform/prebuilts/clang/host/linux-x86" revision="f71cc7fa68ac644595257d6fdebc2e543cb7041c" clone-depth="1" groups="partner" />
   <project path="prebuilts-master/misc" name="platform/prebuilts/misc" revision="android11-release" clone-depth="1" />
 </manifest>
+