Manifest for Android 9.0.0 Release 38 (PD2A.190115.029)

Change-Id: Id16da45086895fdc5aad6400440baed0eb4d3942

default.xml

@@ -4,7 +4,7 @@
   <remote  name="aosp"
            fetch=".."
            review="https://android-review.googlesource.com/" />
-  <default revision="pie-b4s4-release"
+  <default revision="refs/tags/android-9.0.0_r38"
            remote="aosp"
            sync-j="4" />