Overlay for omap3 camera devices.
fix play/rec video
Fix a couple of nasty heap corruption bugs.

- When replacing the buffer pointer with another one, the allocated
  length wasn't updated. As the TI encoder relies of those being matched
up (it e.g. does a memset(pBuffer, 0, nAllocLen) at certain places), this
could lead to random memory being overwritten (or to a segfault when
reaching the end of the mapping)
- When replacing the buffer, the old buffer wasn't saved and restored
  before calling freeBuffer. This led to a different address passed to
free() than was returned by malloc(), could lead to all kinds of weird,
undefined behaviour.

Change-Id: Ibef8de10f71953c41f88f8b840a72beb2e4880ed
Hardcoded fast track latency

Change-Id: I12d32bd95b09e242e383e6e8e2daf65d7776f9a9