Allow user to block individual apps from resuming

This adds a setting which stores a list of packages that will be
prevented from persisting in QS as resumable media controls, even when
resumption is enabled. If the user adds a new package to this list when
it already has a resume control, that control will be removed.

Bug: 161813143
Test: manual, atest
Change-Id: I8c85bc937aeaf366954f2669eba8f6954640fe4c