drm/amd/display: Check link_active instead of lane_settings != unknown
[Why] enable_link_dp_mst checks that cur_link_settings != unknown to determine that the link is already enabled, to skip redundant enablement calls for multiple streams on the same link. During dc_reinitialize_hardware, cur_link_settings on previously-active links is not cleared, which blocks MST links from being re-enabled after a reinitialization. [How] - check for link_status->link_active instead, as it's the real intent - clear cur_link_settings when we clear link_active Signed-off-by: Joshua Aberback <joshua.aberback@amd.com> Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com> Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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