Manifest for Android 8.1.0 Release 2 (OPM2.171019.012)

Change-Id: I80794144561f2ad6f40fedf3a73d9b99715b9dee
diff --git a/default.xml b/default.xml
index db59d0d..d1427da 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-8.1.0_r1"
+  <default revision="refs/tags/android-8.1.0_r2"
            remote="aosp"
            sync-j="4" />