Revert "frameworks/av: Integrate M6 audio software decoder"

This reverts commit 9df40db60567619e53d4e0b5024f8e5b6fdd2e62.
Initial CAF source for DTS M6 integration (for frameworks)

Upgraded initial commit to:
Tag / Build ID LNX.LA.0.0-04110-8084.0 (Android 4.4.2)
frameworks/av: Integrate M6 audio software decoder

Add support to integrate the M6 audio software decoder.