Manifest for Android 8.1.0 Release 28 (OPM4.171019.016.B1)

Change-Id: Ifed1fbd0029d8bbaa6b97ea8685943a662a45337

default.xml

@@ -4,7 +4,7 @@
   <remote  name="aosp"
            fetch=".."
            review="https://android-review.googlesource.com/" />
-  <default revision="refs/tags/android-8.1.0_r27"
+  <default revision="refs/tags/android-8.1.0_r28"
            remote="aosp"
            sync-j="4" />