msm: kgsl: Increase the fenced write timeout

Make the fenced regiser write timeout twice as long
to increase the chances of success. Print a message
after half the time and after the full time to aid
in debugging.

Change-Id: I2cf87acacd40693046962031c598062c8b6bec84
Signed-off-by: Kyle Piefer <kpiefer@codeaurora.org>
Signed-off-by: Carter Cooper <ccooper@codeaurora.org>