msm: kgsl: Enable GPU hang interrupt

Enable and use GPU hang interrupt to detect GPU hangs.
If the GPU hang is not detected using the interrupt we
still have the hang timer to detect GPU hangs. When
hang is detected using GPU hang interrupt fault tolerance
is triggered. Fault tolerance time is less than 50ms with
GPU hang interrupt.

CRs-Fixed: 512795
Change-Id: I9327803f178ae1b5e8248fe3450499b7bba2a68d
Signed-off-by: Tarun Karra <tkarra@codeaurora.org>