Activate hot plugged device

Activate hot plugged audio input device, to match the output device
behavior.

Change-Id: I57ced3f32cf2d60b98043a256ea9d3c10b25280d
Bug: b/355684672, b/374174565
Test: InputRouteManagerTest
Flag: com.android.media.flags.enable_audio_input_device_routing_and_volume_control
2 files changed