msm: kgsl: Make the fence names more readable

Fence names are limited to 32 characters. Rearrange the fence name
format to make sure we get as much debugging information out of it
as possible.

Change-Id: I3cdaab1eae8b523d7b8e44ff0b0a1bd8e487c33d
Signed-off-by: Lynus Vaz <lvaz@codeaurora.org>