msm: vidc: Fix handling EOS with bitstream error.

If the EOS frame has codec config flag set and decoder
return status is bitstream error, then driver was
handling EOS done before the core returned with EOS done.

Fixed by adding a check in the driver to not handle EOS done
until the core returns with EOS done.

CRs-Fixed: 320107
Change-Id: If2c6dc67e5d8e7df54b17443c753f0325b6f5175
Signed-off-by: Deepika Pepakayala <deepikap@codeaurora.org>