There are no any logical changes here.

1. if kcq can be enabled via kiq, we don't need to
   do kiq ring test.
2. amdgpu_ring_test_ring function can be used to
   sync the ring complete, remove the duplicate code.
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Acked-by: NChristian König <christian.koenig@amd.com>
Signed-off-by: NRex Zhu <Rex.Zhu@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>