Add PackageInstaller#uninstallExistingPackage API to TvSystem am: 74cb65d47b am: 6d77d222fc am: 81559ef3dc

Change-Id: I446f822d54b3964a83b4b5cf931ecf94473ff97f
tree: c45e98e7f8b8888658a589b1ac4e808862e2cf8a
  1. Android.bp
  2. api/
  3. java/