msm: kgsl: Make sure gpu-speed-bin-vectors has the correct size

Total number of elements in the gpu-speed-bin-vectors array
should be multiple of number of elements in a speed bin vector.

If number of elements is not a multiple of vector size then
there is a possibilty of out of bound access in the speed-bin
vector array. Also rectify the memory allocated for it.

Change-Id: I9158e4f883eca400a46663b07326fb6f6020155c
Signed-off-by: Sunil Khatri <sunilkh@codeaurora.org>