drm/amdgpu: stop checking GPU reset counter during VMID grab

We do this later on when we flush the VMID anyway.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>