msm: vidc: Add support for Mpeg-2 open-gop handling

ISDB-T client requires flags indicating the correctness
of output YUV data from MPEG-2 decoder. With this commit,
DATA_CORRUPT flag is sent from the driver if the output
YUV is either INCORRECT or APPROX_CORRECT.

Change-Id: I72e8ba81f45200715a195497d4eae140cbe86616
Signed-off-by: Rajeshwar Kurapaty <rkurapat@codeaurora.org>