Manifest for Android 8.1.0 Release 26 (OPM2.171019.029.B1)

Change-Id: I77a665a5645f93b3f5424a6a8b9a4328b572cbe6

default.xml

@@ -4,7 +4,7 @@
   <remote  name="aosp"
            fetch=".."
            review="https://android-review.googlesource.com/" />
-  <default revision="refs/tags/android-8.1.0_r25"
+  <default revision="refs/tags/android-8.1.0_r26"
            remote="aosp"
            sync-j="4" />