msm: kgsl: Disable speed bin detection for A610 GPU

Now A610 GPU is having single speed bin. Disable the
speed bin detection support for this GPU as it's no
longer needed.

Change-Id: If34b2635247f71eef0d8928ea66195e789107f8c
Signed-off-by: Deepak Kumar <dkumar@codeaurora.org>