Refactored the Media Player management

Previously all media instances had their own management
and it could easily happen that certain players
would get out of sync as a result. We now have
a unified architecture to listen to media notifications
and inflating a singular UI

Test: atest SystemUiTests
Bug: 154137987
Change-Id: I9f807e6431dd7cb54ca9b6d983379d770a281f31