Manifest for Android 7.1.2 Release 4 (N2G47H)

Change-Id: Ibe81ba29ce50f0e9f38ff86b7f6c79cc3d61dc3f
diff --git a/default.xml b/default.xml
index 7d5acff..cf9090e 100644
--- a/default.xml
+++ b/default.xml
@@ -4,7 +4,7 @@
   <remote  name="aosp"
            fetch=".."
            review="https://android-review.googlesource.com/" />
-  <default revision="refs/tags/android-7.1.2_r3"
+  <default revision="refs/tags/android-7.1.2_r4"
            remote="aosp"
            sync-j="4" />