Revert "msm: vidc: Initialize kernel space stack variables"

This reverts commit 7b0fa834ccb0a839e765cc8b09de288406c21cd3.
WORKAROUND: mm-video: venc: Correct a typo in variable name

until we have http://goo.gl/jVxRvX merged in qcom media-caf, we
can at least fix the data type to a long, but keep the name like
it is, so we dont break the build because of the missing commit,
meantioned above.

REVERT once the above commit is merged and we implement the real
patch for this.

Change-Id: I91aec18a9452feee78a00dc68d95ccd9cff22ba9