drm/amdgpu: Put enable gfx off feature to a delay thread
delay to enable gfx off feature to avoid gfx on/off frequently suggested by Alex and Evan. Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com> Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com> Signed-off-by: Rex Zhu <Rex.Zhu@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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