drm/amdkfd: Fill amdgpu_task_info for KFD VMs

The amdgpu_task_info will be used when printing VM page fault for KFD
processes.

Signed-off-by: Yong Zhao <Yong.Zhao@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Harish Kasiviswanathan <harish.kasiviswanatha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>