Add PackageInstaller#uninstallExistingPackage API to TvSystem am: 74cb65d47b am: 6aeeb92a0a am: f67b391c37

Change-Id: I15b069b350534b50cd6cb9a0ad3585c8b9497e57
tree: c45e98e7f8b8888658a589b1ac4e808862e2cf8a
  1. Android.bp
  2. api/
  3. java/