[audio] Keep audioserver package state on removal

Listening for package removal is incorrect when dealing with multiuser,
since what the permission provider is actually interested in is app-id
changes.

Since there are some issues with alternate intents (b/358365471), and
app-ids are not re-used during a single boot, prefer to simply leave the
uid-package association following package removal.

Test: manual app install/uninstall within profile
Bug: 338089555
Bug: 400951313
Flag: com.android.media.audio.audioserver_permissions
Change-Id: I3a35d66c319119da889aedbf23a5b044975b7ec8