drm/amdgpu: Decrease compute timeout to 10 s for sriov multiple VF

For multiple VF, after engine hang,as host driver will first
encounter FLR, so has no meanning to set compute to 60s.

v2:
   Refine the patch and comment

Signed-off-by: Emily.Deng <Emily.Deng@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>