msm: vidc: Remove obsolete hack

Remove an obsolete hack that was added when firmware wasn't handling EOS
very well.  The issue has since been fixed in the firmware for a long
time.

Change-Id: I4e57f4443368440b3e15946d5c448c93444873ee
Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>