drm/amdgpu/sriov: Only sriov runtime support use kiq

For sriov, don't use kiq in exclusive mode, as don't know how long time
it will take, some times it will occur exclusive timeout.

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