Manifest for Android 8.1.0 Release 8 (OPM2.171019.016)

Change-Id: I17f5181f79f49f26120cdfdd94975a84d0df8bbf
diff --git a/default.xml b/default.xml
index d1427da..ae1c1bf 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_r2"
+  <default revision="refs/tags/android-8.1.0_r8"
            remote="aosp"
            sync-j="4" />