Root Cause: According to the audio definition, system sounds are UI touch sounds, unlock sounds, etc., so they are controlled by Media strategy.
Solution: Move system sounds, accessibility sounds, DTMF sounds into Media category. Notification category contains notification sounds only.
Bug: 293251163
Test: manual test
Change-Id: Ied3db95dacbd2c0985bdbfccec5575bb5988fc5b
