msm: kgsl: Use correct gpudev for A660 GPU variant

A660 GPU variant has GMU, use GMU specific gpudev for this GPU.

Change-Id: I0f34c88b1c57738fc7a8557c0b3e0cddcea09163
Signed-off-by: Harshitha Sai Neelati <hsaine@codeaurora.org>