manifest: android-9.0.0_r47

Change-Id: I8546400cad036bc7a015ca1e57c3ac4db2ce4c7f

default.xml

@@ -4,7 +4,7 @@
   <remote  name="aosp"
            fetch="https://android.googlesource.com"
            review="https://android-review.googlesource.com/" />
-  <default revision="refs/tags/android-9.0.0_r44"
+  <default revision="refs/tags/android-9.0.0_r47"
            remote="aosp"
            sync-c="true"
            sync-j="12" />