Rename MediaOutputController

No functional changes. Rename MediaOutputController since it is expanded
to also support audio input routing.

Change-Id: I1351707bab48a0491830bff971b46cd1fd8f5478
Bug: b/355684672, b/357122624
Test: atest AudioSwitchControllerTest, MediaOutputAdapterTest,
MediaOutputBaseDialogTest, MediaOutputBroadcastDIalogTest,
MediaOutputDialogTest
Flag: com.android.media.flags.enable_audio_input_device_routing_and_volume_control