drm/i915/dp_link_training: Track link recovery state with an enum

Replace the sequential link training failure counter with an explicit
link recovery state enum.

This makes the recovery states and transitions clearer: idle, automatic
retraining pending, and automatic retraining disabled.

A follow-up change will also move the retrain_disabled flag into this
enum.

v2: (Jani)
- Convert enum intel_dp_link_recovery_state's documentation to be a
  non kernel-doc comment.
- Compare against / set enum values explicitly.

Cc: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260601093836.3057345-16-imre.deak@intel.com

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