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[Why] Tests need to tell if display is connected via USB4 DPIA link. Currently this is only possible via analyzing dmesg logs. [How] Create a per-connector debugfs entry to report if the link is tunneled via USB4 DPIA. Reviewed-by: Wayne Lin <Wayne.Lin@amd.com> Acked-by: Jasdeep Dhillon <jdhillon@amd.com> Signed-off-by: Stylon Wang <stylon.wang@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>