audio: add implementation for TV related API

1. AudioDescriptionMixLevel getter/setter.
2. DualMonoMode getter/setter.
3. PlaybackRate getter/setter.

Test: TIS player with instrumented HAL
Test: atest AudioTrackTest#testTunerConfiguration
Test: atest AudioTrackTest#testDualMonoMode
Test: atest AudioTrackTest#testAudioDescriptionMixLevel
Test: atest AudioManagerTest#testGetAdditionalOutputDeviceDelay
Bug: 173482792
Change-Id: I7e4f14387b45a5387ba2c4e8797edf18f373b936