Merge "Cleanup and simplify MediaDevice-related classes" into main

...c/com/android/settingslib/media/BluetoothMediaDevice.java

...src/com/android/settingslib/media/ComplexMediaDevice.java

...ib/src/com/android/settingslib/media/InfoMediaDevice.java

.../src/com/android/settingslib/media/LocalMediaManager.java

...ngsLib/src/com/android/settingslib/media/MediaDevice.java

...b/src/com/android/settingslib/media/PhoneMediaDevice.java

...rc/com/android/settingslib/media/InfoMediaDeviceTest.java

...c/com/android/settingslib/media/InfoMediaManagerTest.java

.../com/android/settingslib/media/LocalMediaManagerTest.java

...ts/src/com/android/settingslib/media/MediaDeviceTest.java