Remove MediaData object reference

We don't need the entire data here, just the token and resumption
status. Keeping the object will also retain a reference to the artwork
which can take up a lot of memory.

Bug: 234742314
Test: atest MediaTimeoutListenerTest
Test: compare hprof after - no longer in MediaTimeoutListener
Change-Id: Ic17dc19227f69c567624df225ac14d7490a9180d