msm8974: Use mm-parser for Matroska

 * mm-parser can handle HEVC in MKV containers. Use it.

Change-Id: Ib7c39dbf32ae9fac5dc816372b81c5a9e460196d
msm8974: Include FFMPEG codec configuration

Change-Id: I14e6ce64af329bc11aa1fc86fa6081477381e73c