avrcp: Fix MediaPlayerList's circular dependency

MediaPlayerList should depend on the interfaces it defines and not their
derivatives from avrcp.

We need to decouple this to use this code in new upcoming media control
service.

Tag: #feature
Test: atest MediaPlayerListTest BrowserPlayerWrapperTest MediaPlayerWrapperTest
Bug: 150670922
Change-Id: Id879b427618b95973844bdf191deab57a6f4ded0