drm/amd/powerplay: enable ULCK DS for sienna_cichlid
Enable uclk deep sleep for sienna_cichlid. Df cstate kicks in first, then df triggers uclk ds with the sideband. Signed-off-by: NLikun Gao <Likun.Gao@amd.com> Reviewed-by: NKenneth Feng <kenneth.feng@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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