Manifest for Android P preview 2

Change-Id: Icdc0dd0a2c42a7189f1cd509f87e6bad0d4c1723
diff --git a/default.xml b/default.xml
index 8b0c4d4..77512a7 100644
--- a/default.xml
+++ b/default.xml
@@ -4,7 +4,7 @@
   <remote  name="aosp"
            fetch=".."
            review="https://android-review.googlesource.com/" />
-  <default revision="master"
+  <default revision="refs/tags/android-p-preview-2"
            remote="aosp"
            sync-j="4" />