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[Description] For MST, DC already notify MST sink for MST mode, DC stll check DP SINK DPCD register to see if MST enabled. DP RX firmware may not handle this properly. Signed-off-by: Hersen Wu <hersenxs.wu@amd.com> Reviewed-by: Tony Cheng <Tony.Cheng@amd.com> Acked-by: Harry Wentland <harry.wentland@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>