hal: Add support for Native Audio(44.1kHz)

- Changes for device/Usecase selection
- Add new and combo devices for headphones
- Combo device handling
- Add new backend and logic to handle multiple
  backends
- Remove hardcoded mixers and select them
  dynamically based on the device.

Change-Id: I7207291f2c27da13ba0cc77c66de1144f4b9888a