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
* Extract the common part into HearingAidHelper.
* Remove abstract getHearingDevice(). Change to get the hearing device when needed.
* Move several classes from Bluetooth into Accessibility
Bug: 281783079
Test: make RunSettingsRoboTests ROBOTEST_FILTER="(HearingDeviceAudioRoutingBasePreferenceControllerTest|AccessibilityHearingAidPreferenceControllerTest|HearingAidHelperTest|HearingAidAudioRoutingPreferenceControllerTest|HearingDeviceCallRoutingPreferenceControllerTest)"
Change-Id: I79049107409b7086c6dcc8d48a6323e171ed1535