msm: audio: qdsp6v2: Set end of frame flag to avoid aac multiseek issue

- During aac playback, multiple seek lead to target freeze.
- DSP starts decoding when internal buffer size maximum is
  reached, hence, if there are corrupted frames in that buffer,
  the entire set will not be decoded. This results in target freeze.
- Fix is to set the end of frame flag in the buffers that
  are sent to DSP for decoding.

Signed-off-by: Swaminathan Sathappan <Swami@codeaurora.org>
Change-Id: I0135c64e0ebf50bddddd08d73399f95db6409fbd