audio-caf: snd_use_case_apply_voice_acdb: initialise current_mod[]

Change-Id: I38fd1638e34f38e97e9e48a0ddf51bb31e3b10f8
Add Motorola EMU audio dock support

Motorola EMU audio dock (USB->USB charge/audio Y cable) support
can be enabled by BOARD_USES_MOTOROLA_EMU_AUDIO.

- add EMU Antipop mixer control handling
- add Dock Speaker device use case
- fix one missing QCOM_USBAUDIO_ENABLED ifdef

Change-Id: Ie67339b222252411d3c7c0aaea6493a0ff10fd18
Add HAVE_SAMSUNG_AUDIO check in Alsa

Change-Id: Ibaad5bf6006b4745fe26b85939bb556c0b2177ce