Revert "Revert "Revert "audio: Changes for LPA/Tunnel mode"""

This reverts commit abecd88567f78e2444f237e06103383bd266354f.
Revert "audio: Add ifdefs for QCOM audio features"

This reverts commit 013ec610259f984ce07daeca8da87e8061c17cf4.

Conflicts:
	include/system/audio.h

Change-Id: Ie39abdbdb9db4626fdd95b85b134e5175b4ff0ee
Revert "Adding use_small_bufs boolean"

This reverts commit 4377004a0e4086d530f2b5074e8b151baf53be2b.