Merge tag 'android-8.1.0_r51' into android-8.1

Android 8.1.0 Release 51 (OPM8.181105.002)

Conflicts:
	default.xml

Change-Id: I3f836b303472e6a0cd8d176bdbb2a398cd0c4715

default.xml

@@ -3,7 +3,7 @@
   <remote  name="aosp"
            fetch="https://android.googlesource.com"
            review="https://android-review.googlesource.com/" />
-  <default revision="refs/tags/android-8.1.0_r46"
+  <default revision="refs/tags/android-8.1.0_r51"
            remote="aosp"
            sync-c="true"
            sync-j="12" />