Manifest for Android 7.1.2 Release 6 (NHG47K)

Change-Id: Ibba3a57c93b5fdf6baa52a498c81047688e506fa
diff --git a/default.xml b/default.xml
index da5e1c6..d3f1a01 100644
--- a/default.xml
+++ b/default.xml
@@ -4,7 +4,7 @@
   <remote  name="aosp"
            fetch=".."
            review="https://android-review.googlesource.com/" />
-  <default revision="nougat-mr2-release"
+  <default revision="refs/tags/android-7.1.2_r6"
            remote="aosp"
            sync-j="4" />