drm/amd/display: remove unused function dc_link_perform_link_training
This function is not used anywhere, remove it. It was added in
40dd6bd376a4 ("drm/amd/display: Linux Set/Read link rate and lane count
through debugfs") and moved in
fe798de53a7a ("drm/amd/display: Move link
functions from dc to dc_link"), but a user is missing.
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Rouven Czerwinski <r.czerwinski@pengutronix.de>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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