Christian König bcc634f4a8 drm/amdgpu: cleanup the sync code
No need for two functions doing the same, remove one and
add comments what those functions actually do.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
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