Revert "Remove remnants of HWC 0.x"

This reverts commit 71b9c1fab92727b1463226681d7bd61aac85291b.
STE Audio Fix [3/4]

Credits:
- @Paul-L for iplementation
- @percy-g2 for porting to Xperia 2012 devices
Merge pull request #1 from AndroidOpenSourceXperia/kitkat

:)