Support set, get and list preferred audio devices

This commit adds new options to the AudioManager shell command to:
* set preferred audio device for media strategy
* get preferred audio device for media strategy
* list all output audio devices.

Test: Manual testing with a device, adb commands
Bug: b/418571021
Flag: NONE not required
Change-Id: I27cb110a1282ba412ea96fafb610d9c3f224ad19