drm/amdgpu: drop compute ring timeout setting for non-sriov only (v2)

Sriov still wants these error messags on timeout. So, for sriov
use case, the timeout setting on compute rings is kept.

-v2: clean the code

Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Monk Liu <monk.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>