drm/amd/display: Fix debugfs link_settings entry
1. Catch invalid link_rate and link_count settings 2. Call dc interface to overwrite preferred link settings, and wait until next stream update to apply the new settings. Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Fangzhi Zuo <Jerry.Zuo@amd.com> Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com> Acked-by: Solomon Chiu <solomon.chiu@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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