msm: kgsl: Take gpu snapshot if fenced write fails

When write to a fenced register fails, take a gpu snapshot.

Change-Id: I9c0dd060b7064930866f43e4dcdf4a20393fb662
Signed-off-by: Harshdeep Dhatt <hdhatt@codeaurora.org>
Signed-off-by: Urvashi Agrawal <urvaagra@codeaurora.org>