Manifest for Oreo MR1 Release.

Change-Id: Ieb37237355ea8bb911e5f70b412b05e70cae8d35

default.xml

@@ -4,7 +4,7 @@
   <remote  name="aosp"
            fetch=".."
            review="https://android-review.googlesource.com/" />
-  <default revision="oreo-mr1-dev"
+  <default revision="oreo-mr1-release"
            remote="aosp"
            sync-j="4" />