msm: kgsl: Remove dev_err() from fenced write loop

dev_err() can take milliseconds to finish which can allow
GMU to come out of IFPC and go back to IFPC before kgsl gets
a chance to update the fenced register.

Change-Id: Ic1846188213da571c23d52b8a78eb2162a8adc7b
Signed-off-by: Harshdeep Dhatt <hdhatt@codeaurora.org>