audio: New audio formats for PCM Offload

- Add new formats 16/24 bit PCM offload formats

Conflicts:

	include/system/audio.h

Change-Id: I1a0eb1504d8436a679e4c14e199aa2e443b5ebf1
Merge pull request #10 from omnirom/android-4.4

audio: New audio formats for PCM Offload