drm/amd/display: Revert "drm/amd/display: Use drm_connector in create_validate_stream_for_sink"

This reverts commit c4c182b5

.

After this was commit PCON and USB4 issues were observed. A new fix will
be submitted instead.

Signed-off-by: Alex Hung <alex.hung@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>