drm/amdgpu: fix no hdp flush for compute ring

No pfp on compute.

Signed-off-by: monk.liu <monk.liu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
This commit is contained in:
monk.liu 2015-06-02 15:50:33 +08:00 • committed by Alex Deucher
commit d9b5327ad7