Remove ringer repository

This CL removes the repository for now since it is obsolete. It will be
added back when we add more fields or methods for logging.

Flag: com.android.systemui.volume_redesign
Bug: 369993851
Test: Build. Run presubmits.
Change-Id: Idf620723c88a11914164e6bfe005f74bef72188d
4 files changed