Add PackageInstaller#uninstallExistingPackage API to TvSystem am: 74cb65d47b am: 6d77d222fc am: 1c99e79a6d

Change-Id: Iec335198fe1592398533fef1b5aca1e342b64c04
tree: c45e98e7f8b8888658a589b1ac4e808862e2cf8a
  1. Android.bp
  2. api/
  3. java/