Refactor SoundSettings to use more preference controller.

- second round of refactoring SoundSettings to use preference
  controller.
- add controller for Emergency broadcast, Vibrate when ring, Phone
  ringtone, Alarm ringtone, and Notification ringtone.

Bug: 32276590
Test: make RunSettingsRoboTests
Change-Id: Iaff48ecb27bf156a5c8995de20ce7a440b094cdb

tests/robotests/src/com/android/settings/notification/RingVolumePreferenceControllerTest.java

@@ -30,7 +30,6 @@ import com.android.settings.TestConfig;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
-import org.mockito.Answers;
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
 import org.robolectric.annotation.Config;