Remove unused MyTransmitter class

I suspect this class was left here with the purpose of
debugging RTSP. Lacking references and documentation,
this is effectively dead code.

For future RTSP testing, developers should favor unit
testing or a mock RTSP server for end-to-end integration
debugging.

Test: Manually built the tree.
Change-Id: Ib103e6d257f0694b8dc6b5e9da2b5eaac9d74a7e