drm/amd/display: Reverting "Add connector to the state if DSC debugfs is set"

This reverts commit c44a22b3.

Reason for revert: Patch introduces performance issues and might
cause memory consistency problems with multiple connectors.

Signed-off-by: Eryk Brol <eryk.brol@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>