drm/i915/dp_link_training: Introduce link training state struct

Start isolating the link training state from the generic DP code by
introducing a separate intel_dp_link_training state struct.

Allocate the state so it can remain opaque within its own module.

Follow-up changes will move link training fields from the DP struct to
the link training state.

v2: Remove unnecessary function documentation. (Jani)

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/20260601093836.3057345-2-imre.deak@intel.com

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