msm: kgsl: Make fast hang detect generic

Code to get performance counters for fast hang detection is not
specific to adreno device, we use the same performance counter
countables on all adreno devices, so this code should be generic.

Change-Id: I317bd38f8e733c05b5d52571ddede433b12bec02
Signed-off-by: Tarun Karra <tkarra@codeaurora.org>