audio: add separate audio Input path feature

- Separate audio input path can be set using input source of audio parameter
    1. Voice Recognition
    2. Camcording
    3. etc.

Change-Id: I7ab3b529a8d39af412d10d2d7ab4ce111db967bb
5 files changed
tree: 3161016d7bd30146be379ae41420c38bd92fe30f
  1. alsa_sound/
  2. libalsa-intf/
  3. Android.mk