drm/i915/dp_link_training: Add no-fallback link recovery state

Replace the misnamed retrain_disabled flag with a dedicated link
recovery state indicating that no fallback link configurations remain.

This clarifies the meaning of the state: it has always represented the
situation where no further fallback link configurations are available.

While at it, add a TODO comment to the debugfs entry, to expose this
state via a more appropriately named entry.

Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260601093836.3057345-17-imre.deak@intel.com

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