drm/msm: Add a submit queue flag to disable the QoS timer

Allow priviliged (CAP_SYS_ADMIN) processes to disable the
hangcheck / quality of service timer to allow individual
submits to run for as long as they need.

Change-Id: Ic0dedbad1399ebe7c6db74ba374bfa3a6f72917a
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>