AudioPolicy: Reject offloading for non-music streams

- Reject output request if called with non-music stream
  type but with AUDIO_OUTPUT_FLAG_COMPRESS_OFFLOAD

- This will allow the client to fall back to SW decode or
  deal with the error appropriately.

Change-Id: Ib7a805a884b02b3e5169da334292dfb776fe41bf
raw : Increase the input/output buffer size of raw omx component.

 -Few specific flac clips are not playing using QTI-FLAC decoder.
 -Nuplayer uses the OMX component of default RAW decoder for FLAC codec,
  So increase the input/output buffer size of raw omx component to
  support specific flac clips.

Change-Id: Ieb528b0b210a8649d86b4ccde940256472b95443