manifest: android-9.0.0_r30 -> android-9.0.0_r31

Change-Id: I7a7cbb5d9389c5d5f45e0ab15b034e6cd5e57b85
1 file changed
tree: e3c8daac121faa7589b68a2daa405a39c8542130
  1. snippets/
  2. default.xml
  3. README.mkdn