OMXCodec: don't time out wait for buffer when encoding

- this is how it's in ICS and JellyBean (because of time-laps video rec)
- reason for this change is that a time out sometimes happens in case of
  TI aac encoder (that uses rather big output buffers in our case)
- TODO: maybe just an increase of the time out when encoding would be
  better solution than infinite wait?

Change-Id: If7fd2186a50299e4b070f68a8ee076d11c3b40d7