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[Why] within dc link detecion, dp link training will be executed for external sst dp. for debug purpose, we may need skip dp link training. [How] expose dc debug option to skip_detection_link_training to debugfs Reviewed-by: Roman Li <Roman.Li@amd.com> Acked-by: Pavle Kotarac <Pavle.Kotarac@amd.com> Signed-off-by: hersen wu <hersenxs.wu@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>