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

This reverts commit 73ece75c11d554128210a3edc28013962171a252.

Change-Id: Ic70966487d83cde11ec90b9fe6db50b343befaf9
Squashed commit of the upstream kernel changes

This brings our kernel in sync with cdesai's work on CM,
primarily merging in CAF kk_2.7

I removed the commit messages from this commit message as there
were just way too damn many...

Change-Id: Ie2b98576c2032cc18678738cf8cc92cd7afae688