Adjust the streaming testapp for new API

Modify initialize() to take a MbmsStreamingManagerCallback instead of an
IMbmsStreamingManagerCallback and startStreaming to take a
StreamingServiceCallback instead of IStreamingServiceCallback.

Test: builds
Bug: 30981736
Merged-In: I33e9974174176107954cf14508734fdf8c1f98f7
Change-Id: I7b628c6353069ab5aeb69b53b82952eec3036f68
3 files changed