Revert "msm8974: Enable OMX hardware AAC decoder"

This reverts commit 364881b51a6a430b1e9791b37c96c178be78a980, it
still has some state management issues
msm8974: Offload MPEG2 audio

Change-Id: Ib524421c3aa7b2067644bd6ff86802bcb50fea65
msm8974: Use FFMPEG for WMA/WMV

 * Not supported in DSP

Change-Id: I938f27236809676411723786d18c047320ee12d4