msm: kgsl: Option to disable GPU fault tolerance

When GPU Fault tolerance is set to KGSL_FT_OFF do not run
fault tolerance. When we turn off fault tolerance
a) If GPU continues executing commands then
   GPU stall detection is false
b) If GPU does not execute further commands then
   GPU stall detection is correct

When GPU stall detection is suspected to be false,
we can use this option to confirm stall detection.

Change-Id: Iac4d235377df015db223df9ec5597fb43d4c8878
Signed-off-by: Tarun Karra <tkarra@codeaurora.org>