Revert "drm/amdgpu: Add judgement to avoid infinite loop"

The commit d5e8ff5f ("drm/amdgpu: Fixed the defect of soft lock caused by infinite loop")
had fixed this defect.

Revert workaround
commit a2170b4a ("drm/amdgpu: Add judgement to avoid infinite loop").

Signed-off-by: yipechai <YiPeng.Chai@amd.com>
Reviewed-by: Tao Zhou <tao.zhou1@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>