Revert "msm: mdss: allow threads to be interruptible"

This reverts commit 6f2d0fbc2176f076701e47129df843be584631b7.

Change-Id: I1d5c6d774187fd8126cd17efd3c51a0a476fbd8b
(cherry picked from commit d41e37a8c52645efa2373f54a9ac3cfaa548eec2)