Add tests for the automatic audio device categorization

Testing the forwarded AudioDeviceBroker methods calls that query and
modify the internal AdiDeviceState objects which store the audio device
categorization information

Test: adb shell device_config put media_audio android.media.audio.automatic_bt_device_type true
Test: atest AudioDeviceBrokerTest
Bug: 302323921
Change-Id: I6f0b3a50fd6ad2c16ad4b5bedd0319414d28a417