Second part of speeding up video recording frame rate

1. Avoid copying the input recording frames to the encoder via OMX interface
   for TI video encoder
   This is a missing change for part one which help reduces the CPU load.

2. Release output buffers as early as possible. This is a little bit helpful, but not critical.

TODO:
We should save the underlying pointers allocated by the OMX component before we replace them
and restore them before we call OMX_FreeBuffer()!

Change-Id: Ib3a88978f4c3b1153808872eaa7ac4c265a811ff