Fix audio_engine API for 4.3

These methods are likely to be needed and accessible through other
means, so keep them around until the updated API is actually read

Change-Id: Icba0e95f3f293279f260df92e6bd6b1aea5ed7bc
Merge branch 'cm-10.2' of https://github.com/CyanogenMod/android_packages_apps_DSPManager.git into cm-10.1