libstagefright: Enable frame by frame mode

- Enable frame by frame for all formats - local playback & http
  streaming.
- Arbitrary mode is enabled only for specific formats by setting
  a new key (kKeyUseArbitraryMode) in extractor, for following
  formats :
  - H264 Interlaced clips
  - VC1 Advance profile clips
  - MPEG4 in AVI container
- If the arbitrary mode key is not set by the extractor, it will
  default to frame by frame mode for all video clips except
  interlaced clips.
- Adds SPS parsing functionality.

Change-Id: If8c47d0499720eead86b4c4fbe74696aba4423fb
CRs-Fixed: 322872