audio: provide a hook for audio amplifier implementations

Example: http://review.cyanogenmod.org/#/c/38221

Change-Id: Ib236598a5888b2af19bcfb81e285f644a0e84c0d
3 files changed
tree: 380fe3b02b48f0e463d5b95b9ad2302b2cb05255
  1. alsa_sound/
  2. audiod/
  3. libalsa-intf/
  4. mm-audio/
  5. msm7x30/
  6. msm8660/
  7. Android.mk