manifest: android-9.0.0_r16 -> android-9.0.0_r21

Change-Id: Iec63dd87b6382512ec4f94a52eeef8a4674b8576
1 file changed
tree: affbfd2f6213eb465c81c7c211999b6217238eaa
  1. snippets/
  2. default.xml
  3. README.mkdn