stagefright: Remove deprecated FFMPEG config

<?xml version="1.0" encoding="utf-8" ?>

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     Licensed under the Apache License, Version 2.0 (the "License");

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<Included>

    <Decoders>

        <!--  ffmpeg audio codecs -->

        <MediaCodec name="OMX.ffmpeg.aac.decoder"    type="audio/mp4a-latm" />

        <MediaCodec name="OMX.ffmpeg.wma.decoder"    type="audio/x-ms-wma" />

        <MediaCodec name="OMX.ffmpeg.ra.decoder"     type="audio/vnd.rn-realaudio" />

        <MediaCodec name="OMX.ffmpeg.flac.decoder"   type="audio/flac" />

        <MediaCodec name="OMX.ffmpeg.mp2.decoder"    type="audio/mpeg-L2" />

        <MediaCodec name="OMX.ffmpeg.ac3.decoder"    type="audio/ac3" />

        <MediaCodec name="OMX.ffmpeg.ape.decoder"    type="audio/x-ape" />

        <MediaCodec name="OMX.ffmpeg.dts.decoder"    type="audio/vnd.dts" />

        <MediaCodec name="OMX.ffmpeg.atrial.decoder" type="audio/ffmpeg" />

        <!--  ffmpeg video codecs -->

        <MediaCodec name="OMX.ffmpeg.mpeg2.decoder"  type="video/mpeg2"/>

        <MediaCodec name="OMX.ffmpeg.wmv.decoder"    type="video/x-ms-wmv"/>

        <MediaCodec name="OMX.ffmpeg.rv.decoder"     type="video/vnd.rn-realvideo"/>

        <MediaCodec name="OMX.ffmpeg.flv1.decoder"   type="video/x-flv"/>

        <MediaCodec name="OMX.ffmpeg.vc1.decoder"    type="video/vc1" />

        <MediaCodec name="OMX.ffmpeg.vtrial.decoder" type="video/ffmpeg" />

    </Decoders>

</Included>