Copy support MediaRouter code

- Copied the code from framework/support/v7/mediarouter
- Changed the package names
- Updated copyrights
- Removed the use of support annotations
- TODO: Use MediaRouter from MediaControlView2
- TODO: Make support MediaRouter use updatable code

Test: build
Change-Id: I1eb9330fd6a19b74916a04c48d971903b6390b70