drm/i915/dp_link_training: Add helper to mark link training failure

Add link_recovery_mark_train_failure() to record the failure and make
the link recovery state transition explicit after a link training
failure: recovery can continue with an autoretrain, or must be handed
over to userspace after fallback selection.

This also prepares for replacing the sequential link training failure
counter with an enum in a follow-up change.

v2: (Jani)
- Convert link_recovery_mark_train_failure()'s documentation to be a
  non kernel-doc comment.
- Rename can_autoretrain flag to autoretrain_allowed.

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/20260601093836.3057345-14-imre.deak@intel.com

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