frameworks/base: Use ExtendedRemoteDisplay to launch Wifi Display

- RemoteDisplay class is used to launch WiFi Display
  implementation in the Android framework with a discovered peer.
  There is a need to support proprietary implementation of wifi
  display instead of the framework implementation.

- To enable this support, ExtendedRemoteDisplay is added,
  which launches the proprietary solution. ExtendedRemoteDisplay object
  is created if the class is available in the package. If the class is
  not available the default implementation will be used by creating
  RemoteDisplay.

Change-Id: I2e2a5e552bc86888848c0402bafd873620b05c21
(cherry picked from commit 912d47682c5ec65ff0aaa0a59cc5d28110482392)
(cherry picked from commit a9c91658d40a38f4f6e204a33d9bc70bcf97ede3)